Before posting here I did try Googling the issue, but nothing useful showed up.

My Music folder does not go as deep as yours (~/Music/Music/Music Library.musiclibrary), yet it still functions. ??

I do have a second library on the startup drive, in addition to the one on the external drive.

I think I will do the trash and recreate route and post back with some results.

Thanks.

On a Mac since 1984.
Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.