Disable, remove, or rescan third-party Audio Units plug-ins

If Logic Pro X or MainStage isn't working properly and you're using third-party plug-ins, try the steps in this article to help fix the issue. 

An incompatible or damaged third-party Audio Units plug-in can cause issues in Logic Pro X or MainStage. Try any of the following to fix your issue, depending on what you're experiencing:

Disable Audio Units plug-ins

If you're having an issue in a particular Logic Pro project or MainStage concert, note the third-party plug-ins you're using in the affected project. Then, try disabling the plug-ins one-by-one using the Plug-In Manager, testing the project after disabling each plug-in.

  1. Open Logic Pro or MainStage. In MainStage, you must open a concert to access the Plug-In Manager.  In Logic Pro, make sure to turn on Show Advanced Tools.
  2. Choose Logic Pro X > Preferences > Plug-In Manager, or MainStage 3 > Plug-In Manager.
  3. Locate the plug-in you want to disable, then deselect the checkbox in the Use column. To filter the list by manufacturer, click the manufacturer's name in the left column.
  4. For the changes to take effect, quit and reopen Logic Pro or MainStage. 
  5. Test the project or concert. If the issue no longer occurs, try reinstalling the disabled plug-in, or check with the manufacturer for an update.

Remove Audio Units plug-ins

If you can’t open Logic Pro or MainStage, try manually removing plug-ins.

  1. Find the plug-in file on your Mac
  2. If you suspect a particular plug-in, locate the file for the plug-in in the folder, the drag the file to the Desktop.
  3. Try to reopen the app.

If you still can't open Logic Pro or MainStage:

  1. Create a new folder on the Desktop.
  2. Move all the plug-in files that appear in their installation locations to the new folder.
  3. Try to open Logic Pro or MainStage.
  4. If you can open the app, replace each plug-in file to its original location one-by-one. Quit and reopen the app after you replace each plug-in file. If you can't open the app after replacing a particular plug-in file, that plug-in might be corrupted or incompatible. Try reinstalling the disabled plug-in, or check with the manufacturer for an update.

Restart your Mac

If your Mac is running macOS High Sierra and you recently installed a plug-in that isn't available in Logic Pro or MainStage, restart your Mac. Before you restart your Mac, confirm that the plug-in is 64-bit compatible.* 

  1. Choose Apple > Restart.
  2. Open Logic Pro or MainStage, and check to see if the plug-in is available in your project or concert. If the plug-in still isn't available, rescan the plug-in.

* 32-bit plug-ins aren't compatible with Logic Pro or MainStage.

Confirm that the plug-in is installed

If you can't find the recently-installed plug-in in Logic Pro or MainStage after restarting your Mac, confirm that the plug-in is installed:

  1. Choose Logic Pro X > Preferences > Plug-in Manager, or MainStage 3 > Plug-in Manager.
  2. In the Plug-in Manager, locate the plug-in. To filter the list by manufacturer, click the manufacturer's name in the left column. 
  3. If the plug-in doesn't appear in the Plug-In Manager, find the plug-in file.*
  4. Reinstall the plug-in, then restart the computer.
  5. If the plug-in still isn't available, check with the manufacturer to see if the plug-in is compatible with your version of macOS, and for possible updates.

* If "not authorized" appears in the Compatibility column for the plug-in, make sure the plug-in is properly authorized as documented by the manufacturer.

Rescan a plug-in

If the recently-installed plug-in is installed, use the Plug-in Manager to rescan the plug-in.

  1. Choose Logic Pro X > Preferences > Plug-In Manager, or MainStage 3 > Plug-In Manager. 
  2. In the plug-in Manager, locate the plug-in you want to check. To filter by manufacturer, click manufacturer's name in the left column.
  3. If "failed validation" appears in the Compatibility column for the plug-in, highlight the plug-in, then click Rescan & Reset Selection.*
  4. If the plug-in fails validation again, check with the manufacturer to see if the plug-in is compatible with your version of macOS, and for possible updates.

* If "not authorized" appears in the Compatibility column for the plug-in, make sure the plug-in is properly authorized as documented by the manufacturer. Then, rescan the plug-in.

Rescan all plug-ins

To automatically rescan all installed plug-ins, remove the Audio Unit cache file.

  1. In the Finder press Option and choose Go > Library.
  2. In the Finder window go into ~Library/Caches/AudioUnitCache.
  3. Move the files from AudioUnitCache folder to the Desktop. 
  4. Restart the computer, then open Logic Pro X or MainStage. All installed Audio Unit plug-ins will be rescanned.

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