Have you updated an Audio Units plugin, and then found it missing next time you launch your DAW, even after rescanning plugins? You probably need to clear your Audio Units cache. For whatever reason (please visualize me serving my strongest side-eye towards Cupertino here) this has often been needed.
The first hit on Google for "clear audio units cache" no longer reflects current best practices on this, so I'm adding my own instructions here:
- Close any DAW or AU host you are running
- in Finder, hold down the Option key, click on the Go menu at the top of your screen and select Library
Delete the following files from ~/Library, if they are present:
~/Library/Caches/com.apple.audiounits.cache ~/Library/Caches/AudioUnitCache/ ~/Library/Preferences/com.apple.audio.InfoHelper.plist ~/Library/Preferences/com.apple.audio.SandboxHelper.plist
Restart your computer
That should do it.
That's helpful, thanks.