How do I clear my Audio Unit cache?

  1. In the Finder, choose Go > Go to Folder from the menu.
  2. Type ~/Library/Caches in the "Go to the folder" field.
  3. Press the Go button
    1. Remove the "com.apple.audiounits.cache" file.
    2. Remove the ~/Library/Caches/AudioUnitCache folder
The next time you start Logic, the installed Audio Unit plug-ins will be rescanned and Logic should then startup normally.