...Ik had gehoopt dat het een plist probleem zou zijn.
Step 1. Go to iTunes media folder under this path on your computer:For Mac OS: "/Users/username/Music/iTunes";Step 2. Delete the following files: "iTunes Library.itl", "iTunes Library Genius.itdb", "sentinel" (make sure you have hidden files shown in Finder), and "iTunes Library Extras.itdb".Step 3. If you enabled iCloud Music Library when opening iTunes, then click on "File" and select "Add to Library". Navigate to your existing "iTunes Media" folder, highlight it and click "Open". iTunes will reimport your existing media files automatically.Step 4. If you do not have iCloud Music Library enabled, you may get an error message asking you to select a folder for your iTunes library. Select your existing library folder and repeat the steps above to re-add all of your media files.