Gotcha. Thanks!
So the new engine to fix the complaints about the aging AppleTV client is only in the New Experience track… definitely would be frustrated as AppleTV Plex user. 
I’d been debating trying AppleTV on my aging Roku TV but seeing all the back and forth in these areas the last several months have me just sticking with my familiar Roku setup (with DTS passthrough the ATV doesn’t have - though I’d like Plex to update the 7.1 DTS passthrough support).
Some good info in this thread… thanks all!
Edit: I happened to have a new DTS-HD MA 7.1 file so tested it… it direct played!
Guess one of the updates in the last few months silently addressed it. Thanks!
Edit2: Nope… still buggy. Some 7.1 play now and some don’t… same setting for the rips so dunno what’s different. Also, oddly, the “Audio” settings option disappeared and re-appeared on two different Roku devices while fiddling… anyways that’s all off-topic. Got excited… sorry for the distraction.
