After suggestions about how great Plex is, I installed the server on MBP and client on aTV4. I then let it fully index the contents of a movie folder on an external HDD connected to my AEBS. To test, I played Avatar (mp4 (h.264), 2 audio tracks #1 AAC stereo, #2 AC3 DD). Got a lot of buffering, like every few minutes. Also noticed that my AVR indicated the audio output was PCM. Went into the aTV setting and change Surround setting from Auto to DD. Restarted and got DD showing up on my AVR. Next, wanted to see if the HomeSharing had the same buffering problem. So I played the same file through HS. No buffering at all, however, the AVR indicated the audio was PCM. I went to the movie info by pulling down at the top of the screen and it has an audio selection, but it does not give me the option of choosing DD. It shows it but doesn't let me check it. Also, I played a Purchased iTunes movie and the AVR shows DD. So the issue is definitely with playing local files through HS on the aTV4 and not the aTV3. I have encoded all of my mp4's using Handbrake and have the 1st track as AAC stereo and the second track as AC3 DD. This was a standard transcoding setup and i had no problem with the aTV3. It looks like the aTV4 automatically selects the first audio track and won't let me change it. Has anyone else noticed this or have a solution to it? Finally...what's up with the buffering using Plex? I'm not even challenging it with a on-the-fly transcode and buffers like crazy. My AEBS is in the same room, wifi is smokin' (300Mbps). I do like the Plex interface but not worth using with the current buffering issue. Any ideas on that?