I installed the latest 1.13.0.5023 version of Plex yesterday, and since this the SamSung tv Plex app can no longer play titles. The app freezes when you select to play a title. This all worked fine until this latest version was installed.
I turned on the TV today and went to plex and an update came through, reran Plex on the TV and all is good again, I just must have been too quick for the server update.