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Plex; Introducing Plex Photos Beta
(www.plex.tv)
This is a most excellent place for technology news and articles.
As someone else said, this almost always comes down to the device they’re using. Especially if it’s a Playstation console or a Smart TV (in my experience) as they don’t support x265 codec or have .ass support, or both
I’ve noticed Roku TVs are a common device to have issues.