@JuiceWSA said:
The Plex Dance®:
- remove show/movie from library
- update library
- empty trash
- clean bundles
https://support.plex.tv/hc/en-us/articles/200392106-Library-Actions <— update library, empty trash, clean bundles- bring names and structures into compliance/ or the ultimate bundle reboot operation
- replace corrected show/movie into library
- update library
All Steps. In Order. No Shortcuts.
This worked for me. Thank you for the solution. I also believe the whole certificate palaver with the TVDB web certificate on Windows Server has played a part in fixing the solution, it probably just needed this refresh to get it working.