I finally fixed my problem with the help of Terramaster support (Plex engineer).
The libraries were corrupted,
- you need to stop Plex,
- then rename/backup these 2 library files:
- Then use the latest backup files of those 2 files and rename them as the original.
- Start Plex.
Did work for me. Excellent support from Terramaster, I didn’t know they give this kind of support.
Hope it helps someone,