InvokeAI Version 2.2.0

With InvokeAI 2.2, this project now provides enthusiasts and professionals a robust workflow solution for creating AI-generated and human facilitated compositions. Additional enhancements have been made as well, improving safety, ease of use, and installation.

Optimized for efficiency, InvokeAI needs only ~3.5GB of VRAM to generate a 512x768 image (and less for smaller images), and is compatible with Windows/Linux/Mac (M1 & M2).

You can see the release video here, which introduces the main WebUI enhancement for version 2.2 - The Unified Canvas. This new workflow is the biggest enhancement added to the WebUI to date, and unlocks a stunning amount of potential for users to create and iterate on their creations. The following sections describe what's new for InvokeAI.

Update 1 December 2022 -

• The Unified Canvas: The Web UI now features a fully fitted infinite canvas that is capable of outpainting, inpainting, img2img and txt2img so you can streamline and extend your creative workflow. The canvas was rewritten to improve performance greatly and bring support for a variety of features like Paint Brushing, Unlimited History, Real-Time Progress displays and more.

• Embedding Management: Easily pull from the top embeddings on Huggingface directly within Invoke, using the embed token to generate the exact style you want. With the ability to use multiple embeds simultaneously, you can easily import and explore different styles within the same session!

• Viewer: The Web UI now also features a Viewer that lets you inspect your invocations in greater detail. No more opening the images in your external file explorer, even with large upscaled images!

• 1 Click Installer Launch: With our official 1-click installation launch, using our tool has never been easier. Our OS specific bundles (Mac M1/M2, Windows, and Linux) will get everything set up for you. Click and get going - It’s now simple to get started with InvokeAI. See Installation.

• Model Safety: A checkpoint scanner (picklescan) has been added to the initialization process of new models, helping with security against malicious and evil pickles.

• DPM++2 Experimental Samplers: New samplers have been added! Please note that these are experimental, and are subject to change in the future as we continue to enhance our backend system.

First-time Installation

For those installing InvokeAI for the first time, please use this recipe:
For automated installation, open up the "Assets" section below and download one of the InvokeAI-*.zip files. The instructions in the Installation section of the InvokeAI docs will provide you with a guide to which file to download and what to do with it when you get it.

For manual installation download one of the "Source Code" archive files located in the Assets below.
Unpack the file, and enter the InvokeAI directory that it creates. Alternatively, you may clone the source code repository using the command git clone http://github.com/invoke-ai/InvokeAI and follow the instructions in Manual Installation.

Upgrading

For those wishing to upgrade from an earlier version, please use this recipe:
Download one of the "Source Code" archive files located in the Assets below.
Unpack the file, and enter the InvokeAI directory that it creates.
Alternatively, if you have previously cloned the InvokeAI repository, you may update it by entering the InvokeAI directory and running the commands git checkout main, followed by git pull
Select the appropriate environment file for your operating system and GPU hardware. A number of files can be found in a new environments-and-requirements directory:

environment-lin-amd.yml # Linux with an AMD (ROCm) GPU
environment-lin-cuda.yml # Linux with an NVIDIA CUDA GPU
environment-mac.yml # Macintoshes with MPS acceleration
environment-win-cuda.yml # Windows with an NVIDA CUDA GPU

Important Step that developers tend to miss! Either copy this environment file to the root directory with the name environment.yml, or make a symbolic link from environment.yml to the selected enrivonment file:

Macintosh and Linux using a symbolic link:
ln -sf environments-and-requirements/environment-xxx-yyy.yml environment.yml

Replace xxx and yyy with the appropriate OS and GPU codes.

Windows:
copy environments-and-requirements\environment-win-cuda.yml environment.yml

When this is done, confirm that a file environment.yml has been created in the InvokeAI root directory and that it points to the correct file in the environments-and-requirements directory.
Now run the following commands in the InvokeAI directory.

conda env update
conda activate invokeai
python scripts/preload_models.py

Additional installation information, including recipes for installing without Conda, can be found in Manual Installation

Known Bugs

1. If you use the binary installer, the autocomplete function will not work on the command line client due to limitations of the version of python that the installer uses. However, all other functions of the command line client, and all features of the web UI will function perfectly well.
2. The PyPatchMatch module, which provides excellent outpainting and inpainting results, does not currently work on Macintoshes. It will work on Linux after a support library is added to the system. See Installing PyPatchMatch.
3. InvokeAI 2.2.0 does not support the Stable Diffusion 2.0 model at the current time, but is expected to provide full support in the near future.
4. The 1650 and 1660ti GPU cards only run in full-precision mode, which greatly limits the size of the models you can load and images you can generate with InvokeAI.

Contributing
Please see CONTRIBUTORS for a list of the many individuals who contributed to this project. Also many thanks to the dozens of patient testers who flushed out bugs in this release before it went live.
Anyone who wishes to contribute to this project, whether documentation, features, bug fixes, code
cleanup, testing, or code reviews, is very much encouraged to do so. If you are unfamiliar with how
to contribute to GitHub projects, here is a
Getting Started Guide. Unlike previous versions of InvokeAI we have now moved all development to the main branch, so please make your pull requests against this branch.

Support
For support, please use this repository's GitHub Issues tracking service. Live support is also available on the InvokeAI Discord server.

InvokeAI Version 2.1.3 - A Stable Diffusion Toolkit

Welcome! Click here to get the latest release!

Read below for the old 2.1.3 release.

Invoke AI 2.1.3

The invoke-ai team is excited to be able to share the release of InvokeAI 2.1 - A Stable Diffusion Toolkit, a project that aims to provide enthusiasts and professionals both a suite of robust image creation tools. Optimized for efficiency, InvokeAI needs only ~3.5GB of VRAM to generate a 512x768 image (and less for smaller images), and is compatible with Windows/Linux/Mac (M1 & M2).

InvokeAI was one of the earliest forks of the core CompVis repo (formerly lstein/stable-diffusion), and recently evolved into a full-fledged community driven and open source stable diffusion toolkit. Version 2.1 of the tool introduces multiple new features and performance enhancements.

This 14-minute YouTube video introduces you to some of the new features contained in this release. The following sections describe what's new in the Web interface (WebGUI) and the command-line interface (CLI).

Version 2.1.3 is primarily a bug fix release that improves the installation process and provides enhanced stability and usability.

Update 22 November - updated invokeAI-src-installer-mac.zip to correct an error downloading the micromamba distirbution.

New features

• A choice of installer scripts that automate installation and configuration. See Installation.
• A streamlined manual installation process that works for both Conda and PIP-only installs. See Manual Installation.
• The ability to save frequently-used startup options (model to load, steps, sampler, etc) in a .invokeai file. See Client
• Support for AMD GPU cards (non-CUDA) on Linux machines.
• Multiple bugs and edge cases squashed.

Installation

For those installing InvokeAI for the first time, please use this recipe:

1. For automated installation, open up the "Assets" section below and download one of the InvokeAI-*.zip files. The instructions in the Installation section of the [InvokeAI docs](https://invoke-ai.github.io/InvokeAI) will provide you with a guide to which file to download and what to do with it when you get it.
2. For manual installation download one of the "Source Code" archive files located in the Assets below.
   • Unpack the file, and enter the InvokeAI directory that it creates.
   • Alternatively, you may clone the source code repository using the command git clone http://github.com/invoke-ai/InvokeAI
   • Follow the instructions in Manual Installation.

Upgrading

For those wishing to upgrade from an earlier version, please use this recipe:

1. Download one of the "Source Code" archive files located in the Assets below.
2. Unpack the file, and enter the InvokeAI directory that it creates.
3. Alternatively, if you have previously cloned the InvokeAI repository, you may update it by entering the InvokeAI directory and running the commands git checkout main, followed by git pull
4. Select the appropriate environment file for your operating system and GPU hardware. A number of files can be found in a new environments-and-requirements directory:

environment-lin-amd.yml     # Linux with an AMD (ROCm) GPU
environment-lin-cuda.yml    # Linux with an NVIDIA CUDA GPU
environment-mac.yml         # Macintoshes with MPS acceleration
environment-win-cuda.yml    # Windows with an NVIDA CUDA GPU

7. Important Step that developers tend to miss! Either copy this environment file to the root directory with the name environment.yml, or make a symbolic link from environment.yml to the selected enrivonment file:

• Macintosh and Linux using a symbolic link:

  ln -sf environments-and-requirements/environment-xxx-yyy.yml environment.yml
  # Replace `xxx` and `yyy` with the appropriate OS and GPU codes.
  

• Windows:

copy environments-and-requirements\environment-win-cuda.yml environment.yml 

When this is done, confirm that a file environment.yml has been created in the InvokeAI root directory and that it points to the correct file in the environments-and-requirements directory.

8. Now run the following commands in the InvokeAI directory.

conda update
conda activate invokeai
python scripts/preload_models.py

Additional installation information, including recipes for installing without Conda, can be found in Manual Installation

Contributing

Please see CONTRIBUTORS for a list of the many individuals who contributed to this project. Also many thanks to the dozens of patient testers who flushed out bugs in this release before it went live.

Anyone who wishes to contribute to this project, whether documentation, features, bug fixes, code
cleanup, testing, or code reviews, is very much encouraged to do so. If you are unfamiliar with how
to contribute to GitHub projects, here is a
Getting Started Guide.

The most important thing is to know about contributing code is to make your pull request against the "development" branch, and not against "main". This will help keep public breakage to a minimum and will allow you to propose more radical
changes.

Support

For support, please use this repository's GitHub Issues tracking service. Live support is also available on the InvokeAI Discord server.

InvokeAI Version 2.1 - A Stable Diffusion Toolkit

The invoke-ai team is excited to be able to share the release of InvokeAI 2.1 - A Stable Diffusion Toolkit, a project that aims to provide enthusiasts and professionals both a suite of robust image creation tools. Optimized for efficiency, InvokeAI needs only ~3.5GB of VRAM to generate a 512x768 image (and less for smaller images), and is compatible with Windows/Linux/Mac (M1 & M2).

InvokeAI was one of the earliest forks of the core CompVis repo (formerly lstein/stable-diffusion), and recently evolved into a full-fledged community driven and open source stable diffusion toolkit. Version 2.1 of the tool introduces multiple new features and performance enhancements.

This 14-minute YouTube video introduces you to some of the new features contained in this release. The following sections describe what's new in the Web interface (WebGUI) and the command-line interface (CLI).

Major new features

• Inpainting support in the WebGUI
• Greatly improved navigation and user experience in the WebGUI
• The prompt syntax has been enhanced with prompt weighting, cross-attention and prompt merging.
• You can now load multiple models and switch among them quickly without leaving the CLI or WebGUI.
• The installation process (via scripts/preload_models.py) now lets you select among several popular Stable Diffusion models and downloads and installs them on your behalf. Among other models, this script will install the current Stable Diffusion 1.5 model as well as a StabilityAI variable autoencoder (VAE) which improves face generation.
• Tired of struggling with photoeditors to get the masked region of for inpainting just right? Let the AI make the mask for you using text masking. This feature allows you to specify the part of the image to paint over using just English-language phrases.
• Tired of seeing the head of your subjects cropped off? Uncrop them in the CLI with the outcrop feature.
• Tired of seeing your subject's bodies duplicated or mangled when generating larger-dimension images? Check out the --hires option in the CLI, or select the corresponding toggle in the WebGUI.
• We now support textual inversion and fine-tune .bin styles and subjects from the Hugging Face archive of SD Concepts. Load the .bin file using the --embedding_path option. (The next version will support merging and loading of multiple simultaneous models).

Installation

To install InvokeAI from scratch, please see the Installation section of the InvokeAI docs.

Upgrading

For those wishing to upgrade from an earlier version, please use the following recipe from within the InvokeAI directory:

Mac users:

conda deactivate
git checkout main
git pull
rm -rf src
conda update -f environment-mac.yml
conda activate invokeai
python scripts/preload_models.py

Windows users:

conda deactivate
git checkout main
git pull
rmdir src /s
conda update
conda activate invokeai
python scripts\preload_models.py

Linux Users

conda deactivate
git checkout main
git pull
rm -rf src
conda update
conda activate invokeai
python scripts/preload_models.py

Contributing

Please see CONTRIBUTORS for a list of the many individuals who contributed to this project. Also many thanks to the dozens of patient testers who flushed out bugs in this release before it went live.

Anyone who wishes to contribute to this project, whether documentation, features, bug fixes, code
cleanup, testing, or code reviews, is very much encouraged to do so. If you are unfamiliar with how
to contribute to GitHub projects, here is a
Getting Started Guide.

The most important thing is to know about contributing code is to make your pull request against the "development" branch, and not against "main". This will help keep public breakage to a minimum and will allow you to propose more radical
changes.

Support

For support, please use this repository's GitHub Issues tracking service. Live support is also available on the InvokeAI Discord server.

Full change log since 2.0.2

• update mac instructions to use invokeai for env name by @willwillems in #1030
• Update .gitignore by @blessedcoolant in #1040
• reintroduce fix for m1 from #579 missing after merge by @skurovec in #1056
• Update Stable_Diffusion_AI_Notebook.ipynb (Take 2) by @ChloeL19 in #1060
• Print out the device type which is used by @manzke in #1073
• Hires Addition by @hipsterusername in #1063
• fix for "1 leaked semaphore objects to clean up at shutdown" on M1 by @skurovec in #1081
• Forward dream.py to invoke.py using the same interpreter, add deprecation warning by @db3000 in #1077
• fix noisy images at high step counts by @lstein in #1086
• Generalize facetool strength argument by @db3000 in #1078
• Enable fast switching among models at the invoke> command line by @lstein in #1066
• Fix Typo, committed changing ldm environment to invokeai by @jdries3 in #1095
• Update generate.py by @unreleased in #1109
• Update 'ldm' env to 'invokeai' in troubleshooting steps by @19wolf in #1125
• Fixed documentation typos and resolved merge conflicts by @rupeshs in #1123
• Fix broken doc links, fix malaprop in the project subtitle by @majick in #1131
• Only output facetool parameters if enhancing faces by @db3000 in #1119
• Update gitignore to ignore codeformer weights at new location by @spezialspezial in #1136
• fix links to point to invoke-ai.github.io #1117 by @mauwii in #1143
• Rework-mkdocs by @mauwii in #1144
• add option to CLI and pngwriter that allows user to set PNG compression level by @lstein in #1127
• Fix img2img DDIM index out of bound by @wfng92 in #1137
• Fix gh actions by @mauwii in #1128
• update mac instructions to use invokeai for env name by @willwillems in #1030
• Update .gitignore by @blessedcoolant in #1040
• reintroduce fix for m1 from #579 missing after merge by @skurovec in #1056
• Update Stable_Diffusion_AI_Notebook.ipynb (Take 2) by @ChloeL19 in #1060
• Print out the device type which is used by @manzke in #1073
• Hires Addition by @hipsterusername in #1063
• fix for "1 leaked semaphore objects to clean up at shutdown" on M1 by @skurovec in #1081
• Forward dream.py to invoke.py using the same interpreter, add deprecation warning by @db3000 in #1077
• fix noisy images at high step counts by @lstein in #1086
• Generalize facetool strength argument by @db3000 in #1078
• Enable fast switching among models at the invoke> command line by @lstein in #1066
• Fix Typo, committed changing ldm environment to invokeai by @jdries3 in #1095
• Fixed documentation typos and resolved merge conflicts by @rupeshs in #1123
• Only output facetool parameters if enhancing faces by @db3000 in #1119
• add option to CLI and pngwriter that allows user to set PNG compression level by @lstein in #1127
• Fix img2img DDIM index out of bound by @wfng92 in #1137
• Add text prompt to inpaint mask support by @lstein in #1133
• Respect http[s] protocol when making socket.io middleware by @damian0815 in #976
• WebUI: Adds Codeformer support by @psychedelicious in #1151
• Skips normalizing prompts for web UI metadata by @psychedelicious in https://github.com/invoke-ai/Invo...

InvokeAI Version 2.0.2 - A Stable Diffusion Toolkit

The invoke-ai team is excited to be able to share the release of InvokeAI 2.0 - A Stable Diffusion Toolkit, a project that aims to provide enthusiasts and professionals both a suite of robust image creation tools. Optimized for efficiency, InvokeAI needs only ~3.5GB of VRAM to generate a 512x768 image (and less for smaller images), and is compatible with Windows/Linux/Mac (M1 & M2).

InvokeAI was one of the earliest forks of the core CompVis repo (formerly lstein/stable-diffusion), and recently evolved into a full-fledged community driven and open source stable diffusion toolkit named InvokeAI. Version 2.0.0 of the tool introduces an entirely new WebUI Front-end with a Desktop mode, and an optimized back-end server that can be interacted with via CLI or extended with your own fork.

Release 2.0.2 updates three Python dependencies that were recently reported to have critical security holes, and enhances documentation. Otherwise, the feature set is identical to 2.0.1.

This version of the app improves in-app workflows leveraging GFPGAN and Codeformer for face restoration, and RealESRGAN upscaling - Additionally, the CLI also supports a large variety of features:

• Inpainting
• Outpainting
• Negative Prompts (prompt unconditioning)
• Fast online model switching
• Textual Inversion
• Improved Quality for Hi-Resolution Images (Embiggen, Hi-res Fixes, etc.)
• And more...

Future updates planned included UI driven outpainting/inpainting, robust Cross Attention support, and an advanced node workflow for automating and sharing your workflows with the community.

What's Changed

• hotfix(venv): rename 'ldm' -> 'invokeai' by @tildebyte in #1014
• Fix two broken links in README by @Miserlou in #1026
• fixed old reference to ldm on activate env by @nunocoracao in #1029
• Fix the link to the weights download page by @Hkmu in #1041
• reintroduce fix for m1 from #579 missing after merge by @skurovec in #1055
• More mkdocs updates by @mauwii in #1057
• Add back old dream.py as legacy_api.py by @CapableWeb in #1070

New Contributors

• @Miserlou made their first contribution in #1026
• @nunocoracao made their first contribution in #1029
• @Hkmu made their first contribution in #1041

Full Changelog: v2.0.0...v2.0.1

What's Changed

• update mac instructions to use invokeai for env name by @willwillems in #1030
• Update .gitignore by @blessedcoolant in #1040
• reintroduce fix for m1 from #579 missing after merge by @skurovec in #1056
• Update Stable_Diffusion_AI_Notebook.ipynb (Take 2) by @ChloeL19 in #1060
• Print out the device type which is used by @manzke in #1073
• Hires Addition by @hipsterusername in #1063
• fix for "1 leaked semaphore objects to clean up at shutdown" on M1 by @skurovec in #1081
• Forward dream.py to invoke.py using the same interpreter, add deprecation warning by @db3000 in #1077
• fix noisy images at high step counts by @lstein in #1086
• Generalize facetool strength argument by @db3000 in #1078
• Enable fast switching among models at the invoke> command line by @lstein in #1066
• Fix Typo, committed changing ldm environment to invokeai by @jdries3 in #1095
• Update generate.py by @unreleased in #1109
• Update 'ldm' env to 'invokeai' in troubleshooting steps by @19wolf in #1125
• Fixed documentation typos and resolved merge conflicts by @rupeshs in #1123
• Fix broken doc links, fix malaprop in the project subtitle by @majick in #1131
• Only output facetool parameters if enhancing faces by @db3000 in #1119
• Update gitignore to ignore codeformer weights at new location by @spezialspezial in #1136
• fix links to point to invoke-ai.github.io #1117 by @mauwii in #1143
• Rework-mkdocs by @mauwii in #1144
• add option to CLI and pngwriter that allows user to set PNG compression level by @lstein in #1127
• Fix img2img DDIM index out of bound by @wfng92 in #1137
• Fix gh actions by @mauwii in #1128

New Contributors

• @willwillems made their first contribution in #1030
• @ChloeL19 made their first contribution in #1060
• @manzke made their first contribution in #1073
• @unreleased made their first contribution in #1109
• @rupeshs made their first contribution in #1123
• @majick made their first contribution in #1131
• @wfng92 made their first contribution in #1137

Full Changelog: v2.0.1...v2.0.2

InvokeAI Version 2.0.1 - A Stable Diffusion Toolkit

The invoke-ai team is excited to be able to share the release of InvokeAI 2.0 - A Stable Diffusion Toolkit, a project that aims to provide enthusiasts and professionals both a suite of robust image creation tools. Optimized for efficiency, InvokeAI needs only ~3.5GB of VRAM to generate a 512x768 image (and less for smaller images), and is compatible with Windows/Linux/Mac (M1 & M2).

InvokeAI was one of the earliest forks of the core CompVis repo (formerly lstein/stable-diffusion), and recently evolved into a full-fledged community driven and open source stable diffusion toolkit named InvokeAI. Version 2.0.0 of the tool introduces an entirely new WebUI Front-end with a Desktop mode, and an optimized back-end server that can be interacted with via CLI or extended with your own fork.

Release 2.0.1 corrects an error that was causing the k* samplers to produce noisy images at high step counts. Otherwise the feature set is the same as 2.0.0.

This version of the app improves in-app workflows leveraging GFPGAN and Codeformer for face restoration, and RealESRGAN upscaling - Additionally, the CLI also supports a large variety of features:

• Inpainting
• Outpainting
• Negative Prompts (prompt unconditioning)
• Fast online model switching
• Textual Inversion
• Improved Quality for Hi-Resolution Images (Embiggen, Hi-res Fixes, etc.)
• And more...

Future updates planned included UI driven outpainting/inpainting, robust Cross Attention support, and an advanced node workflow for automating and sharing your workflows with the community.

What's Changed

• hotfix(venv): rename 'ldm' -> 'invokeai' by @tildebyte in #1014
• Fix two broken links in README by @Miserlou in #1026
• fixed old reference to ldm on activate env by @nunocoracao in #1029
• Fix the link to the weights download page by @Hkmu in #1041
• reintroduce fix for m1 from #579 missing after merge by @skurovec in #1055
• More mkdocs updates by @mauwii in #1057
• Add back old dream.py as legacy_api.py by @CapableWeb in #1070

New Contributors

• @Miserlou made their first contribution in #1026
• @nunocoracao made their first contribution in #1029
• @Hkmu made their first contribution in #1041

Full Changelog: v2.0.0...v2.0.1

InvokeAI Version 2.0.0 - A Stable Diffusion Toolkit

The invoke-ai team is excited to be able to share the release of InvokeAI 2.0 - A Stable Diffusion Toolkit, a project that aims to provide enthusiasts and professionals both a suite of robust image creation tools. Optimized for efficiency, InvokeAI needs only ~3.5GB of VRAM to generate a 512x768 image (and less for smaller images), and is compatible with Windows/Linux/Mac (M1 & M2).

InvokeAI was one of the earliest forks of the core CompVis repo (formerly lstein/stable-diffusion), and recently evolved into a full-fledged community driven and open source stable diffusion toolkit named InvokeAI. Version 2.0.0 of the tool introduces an entirely new WebUI Front-end with a Desktop mode, and an optimized back-end server that can be interacted with via CLI or extended with your own fork.

This version of the app improves in-app workflows leveraging GFPGAN and Codeformer for face restoration, and RealESRGAN upscaling - Additionally, the CLI also supports a large variety of features:

• Inpainting
• Outpainting
• Negative Prompts (prompt unconditioning)
• Textual Inversion
• Improved Quality for Hi-Resolution Images (Embiggen, Hi-res Fixes, etc.)
• And more...

Future updates planned included UI driven outpainting/inpainting, robust Cross Attention support, and an advanced node workflow for automating and sharing your workflows with the community.

SD-Dream Version 1.14.1

This is identical to release 1.14 except that it reverts the name of the conda environment from "sd-ldm" back to the original "ldm".

Features from 1.14:

• Memory optimizations for small-RAM cards. 512x512 now possible on 4 GB GPUs.
• Full support for Apple hardware with M1 or M2 chips.
• Add "seamless mode" for circular tiling of image. Generates beautiful effects. (prixt).
• Inpainting support.
• Improved web server GUI.
• Lots of code and documentation cleanups.

SD-Dream Version 1.14

• Memory optimizations for small-RAM cards. 512x512 now possible on 4 GB GPUs.
• Full support for Apple hardware with M1 or M2 chips.
• Add "seamless mode" for circular tiling of image. Generates beautiful effects. (prixt).
• Inpainting support.
• Improved web server GUI.
• Lots of code and documentation cleanups.

SD-Dream Version 1.13

New features and bug fixes:

• Support image variations (see VARIATIONS.md) (Kevin Gibbons and many contributors and reviewers)
• Supports a Google Colab notebook for a standalone server running on Google hardware Arturo Mendivil
• WebUI supports GFPGAN/ESRGAN facial reconstruction and upscaling Kevin Gibbons
• WebUI supports incremental display of in-progress images during generation Kevin Gibbons
• A new configuration file scheme that allows new models (including upcoming stable-diffusion-v1.5) to be added without altering the code. (David Wager)
• Can specify --grid on dream.py command line as the default.
• Miscellaneous internal bug and stability fixes.
• Works on M1 Apple hardware (several contributors, but particular thanks to James Reynolds )
• Multiple bug fixes.