very strange: I have 3 libraries classical, modern and sounds. For a small project I changed my standard music library to sounds and cannot switch back to use the standard one. I stopped and started iTunes AND FM513 several times at the same time. Finally I rebooted my iMac but same misbehavior.
Any additional hints?
I suppose the problem is associated with the upgrade to OS X 10.11.6. Cannot remember it happened before