I have been using Plex for years with minimal issues, which I have always been able to figure out pretty quickly.
I use Plex on my Roku and on my LG Smart TV.
A couple weeks ago, I think the Plex channel on Roku had an update, and once it was done, all of my movies disappeared. The plex channel couldn't discover my server, and wouldn't work when I manually input the IP address. Netflix, Amazon, etc. are still working fine on the Roku.
Plex still works fine and all my movies still show up with my LG Smart TV, so i can't figure out what the issue is here.