Follow the recommendations below in the order in which they’re listed until you’ve isolated or fixed your issue. Before proceeding, make sure to back up the Logic Pro X application.
1. Make sure that Logic Pro X is up to date
Make sure that you’re using the latest version of Logic Pro. Choose Apple () menu > App Store, then click Updates in the toolbar. If a Logic Pro X update is available, click the Update button to download and install it.
2. Check device or software compatibility
If you're using an external audio interface, MIDI interface, storage system, control surface, or plug-in not made by Apple, make sure that it’s compatible with the latest version of Logic Pro. Contact the manufacturer for support. If an update is available, follow the manufacturer’s instructions to update the device or software.
3. Check your external audio interface
Sometimes an incompatible or malfunctioning external audio interface can cause issues with Logic Pro. If you’re using an external audio interface, first try to use the built-in audio on your Mac instead of the interface. If the issue continues to occur, open Logic Pro X without audio input and output.
If you aren’t using an external audio interface, try disabling Audio Units plug-ins to continue troubleshooting your issue.
Use built-in audio with Logic Pro X
- Unplug your external audio interface from your Mac.
- Open Logic Pro X, then choose Logic Pro X > Preferences > Audio/MIDI > Devices.
- Choose Built-In Output from the Output Device pop-up menu.
- Choose Built-in Microphone (or Built-in Input, depending on your computer) from the Input Device pop-up menu.
- Open and play back a project that's been experiencing issues.
If the project opens and plays back properly, you might need to update or service your audio interface. Contact the manufacturer for support.
Open Logic Pro X without audio input and output
- Open Logic Pro and immediately press and hold the Control key before a project opens.
- In the alert, click Don’t Launch.
If Logic Pro opens, it can indicate the following:
- You might need to update or service your external audio interface. Contact the manufacturer for support.
- An Audio Units plug-in might be damaged, or it might not be compatible with your version of Logic Pro. You can try disabling plug-ins to troubleshoot your issue.
4. Disable Audio Units plug-ins
If you’re using Audio Units plug-ins, try disabling them. Damaged or incompatible Audio Units plug-ins can create unexpected behavior in Logic Pro.
5. Create a new project
Create and test a new Logic Pro project. Logic Pro projects can occasionally become damaged, causing unexpected behavior.
To create and test a new project:
- Open Logic Pro and create a new empty project.
- Add audio files or Apple Loops to the new project.
- Play back the project. If the new project plays back properly, the project you're having issues with might be damaged.
6. Try using another user account
Open Logic Pro in another user account on your Mac. Logging in as another user can help you figure out if unexpected behavior is related to a specific user's settings or files.
7. Reset Logic Pro X preferences
Resetting preferences doesn’t affect your project files, presets, or patches. However, you do lose any custom preference settings that you might have made.
Before resetting preferences, choose Logic Pro X > Preferences, and note any specific settings that you’ve made. That way, after resetting preferences, you can go back and reapply your custom settings. For information on different preferences, see Logic Pro preferences overview in Logic Pro Help.
To reset Logic Pro preferences, choose Logic Pro > Preferences > Reset All Preferences Except Key Commands.
After resetting preferences, open your project and try to reproduce the issue that you were experiencing. If the issue no longer occurs, open Logic Pro X preferences and reapply your custom settings.
8. Delete user preferences
Before deleting user preferences, note any specific preference settings that you’ve made, and save any custom key commands you've created. Deleting preferences removes any custom preference settings and custom key commands.
To delete the user preferences, do the following:
- Quit Logic Pro X.
- In the Finder, choose Go > Go to Folder.
- Enter ~/Library/Preferences, then click Go.
- Remove the "com.apple.logic10.plist" file from the Preferences folder.
- If you upgraded from an earlier version of Logic Pro, also remove the "com.apple.logic.pro" file.
- Restart your Mac.
After deleting preferences, open your project and try to reproduce the issue that you were experiencing. If the issue no longer occurs, open Logic Pro X preferences, reapply your custom settings, and import your custom key commands.
9. Reinstall Logic Pro X
If you still can’t resolve your issue, reinstall Logic Pro X. You don't have to remove everything related to Logic Pro, such as projects. You just remove and reinstall the Logic Pro application.
To reinstall Logic Pro X:
- In the Finder, choose Applications from the Go menu.
- Locate the Logic Pro X application and drag it to the Trash.
- Reinstall Logic Pro from the Mac App Store, or restore it from a backup. When you restore Logic Pro from a backup, you can either drag it from its storage location to your Applications folder, or you can restore it from a Time Machine backup.
- Refer to Logic Pro X Help for further information on settings or installation.
- Visit the Logic Pro X Support page for more articles and support resources for Logic Pro X.
- Join the conversation. Share tips and solutions with fellow Logic Pro X users from all around the world. Visit the Logic Pro X Support Community.