i have this issue like many others it came about when i upgraded to the newest unraid version. i've since downgraded and restored plex from a backup, but i apparently didn't go back far enough.
the only issue i'm seeing is that shows are not staying marked as watched, although its possible some of the strange behavior i'm seeing with posters is because of this as well.
do i have to rebuild plex from the ground up? does that mean that all of my watched info, as well as all of my users watched info will be reset?
is there a way to just, delete this section of the database that is malformed and let plex rebuild that area? its clearly something in the meta data
it appears that this issue only effects one library, could i remove the library and bring it back as a new one?
Plex Media Server.log