My Mac Mini and Windows 10 Plex servers no longer play some videos through the Tivo App. My Roku Plex app has no problems with the same videos. My iPhone through the Mac Mini and Windows servers has no problem with the same videos. My Tivo Mini connected to the Roamio OTA has no problems with the same videos. The message I receive is “There was a problem playing this item. The video did not start playing in time.”
I would have reverted to the earlier software release, but haven’t been able to find it. Any additional information I can provide, I will.