I had a similar issue a while back and I was told that my version of Emby Theater was not up to date as you turned off you auto update and I needed to manually download and reinstall.
I'm having issues playing Trailers again - it was working perfectly not long ago and if I use the WEB interface the trailers play perfectly.
It is only when I use Emby Theater that Trailers don;t work. All I get is the revolving circle forever.
I am running Emby Server 126.96.36.199 and Emby Theater version 3.0.1
It's super frustrating that things work perfectly and then don't without any changes to my system
Can some please advise what I should do to get this stable?
Many thanks Rob