I did the update for iTunes 11.4. Now iTunes will not open on my Mac. Can you fix it?
This is a major issue that's being addressed on the official forums as well. However, based on the other users problems, there is something in the 11.4 update that messes up the system. The only way to fix the solution is to re-install the application.
You can check the forums to see that this solution has been approved and confirmed as working.
Community forums: https://discussions.apple.com/thread/6894376?start=0&tstart=0