After the latest update, I lost my access to my music library (I have an older basic Buffalo Linkstation NAS - LS210D). I am pretty certain I was using SMB2 protocol.
Although I don’t recall any issues before, I checked and changed the folder access to read-only and access is restored.
from 4 mos ago post by Ken_Griffiths:
The username and password assigned for access to the shared library folder needs to be a user on the PC that has read-only (ideally) permission on the MUSIC share - check the folder properties on the PC to see which user(s) and what permission they may have to access the share and its sub folders and files.