I have been having a great deal of trouble with the program freezing up on me when I select a library item. The item will begin flickering and the program is frozen requiring a Force Quit. I have a late 2015 iMac os High Sierra, 33 GHz Intel Core i5, 8 GB, AMD Radeon R9 M395X 4096 MB graphics card. Several sessions with tech support, nothing keeps it from recurring every few days, currently can't use the library. I've restarted, shutdown, re-downloaded software. Any ideas out there?