Unable to play any media - Playback failed due to a fatal player error

[Temmy]

Hello folks,

I'm running Jellyfin on a Synology DS423+. This is installed via SynoCommunity. 

   

This has been running fine without issue, but today whenever I try to play something I'm getting a variety of Playback Failed or "Fatal Player Errors". This happens on both the web, windows desktop and Android clients.

   

I can still see and access the media via my NAS. It hasn't changed folders or location.

I can connect to the Jellyfin dashboard, I just can't seem to play any media. I tried restarting the DS423+ and Jellyfin package however that has had no effect. 

Logs attached. 

Thank you.

[Temmy]

Well, I deleted my libraries in Jellyfin and remade them, and now things are working fine again. The suggestion seems to be the media files couldn't be found, but unless the NAS has done something, they're still in the same place as they always were. Strange.