My Xbox 360 will no longer run Plex. I do not know if this is a Microsoft issue or Plex issue... I've done the following troubleshooting:
Deleted the Plex App.
Cleared the Cache.
Removed the Device on my Server.
Authenticated with new Pin.
Reformatted my Xbox 360.
None of these fixed the issue. PMS works just fine on my PC's, Web, Xbox One, Roku Ultra, Roku 3, Roku Stick, ect...
Again, I'm not sure where the problem is...