I'm using Synthogy Ivory American Concert D and I loaded the 50 GB library on an external usb drive because my laptop doesn't have enough space for it.

All worked fine until one day it didn't. Whenever I open the Ivory Standalone application, it doesn't seem to have access to the library (see screenshot). Also, when I go to the 'get info' window for my external usb drive, it says: You have custom access. I think it might have to do with me updating to the latest MacOS version.

Does anybody know how I can solve this?