I upgraded to the new media scanners quite some time ago. Just yesterday, I tried downgrading (from Plex Series Scanner → Plex TV Series) which worked fine. Now, however, I’m trying to switch it back to the newer one again and am getting this error:
Errors in PUT request: <html><head><title>Bad Request</title></head><body><h1>400 Bad Request</h1></body></html>'language' is invalid
Ahh sorry. No, that doesn’t work either. When I change it the agent to Personal it says the scanner to the old one, and when I set the scanner to the new one it sets the agent back to a Plex one.
Fwiw, this is happening to both a movie and a TV shows library
Well now something interesting happened…I created two fresh new libraries just in case I needed them, and then I got a message to upgrade my libraries…and that worked! It set the language to Indonesian (not my language) but set the scanner and agent correctly and I was and to change the language and save.
So, fingers crossed, it might have worked! But definitely seems like there’s a possible edge-case bug with upgrading->downgrading->upgrading.