I watched a mkv file on Satdreamgr a few days ago, file #1 of a series of 6 (approx 60 minutes long) and it played fine. I updated to latest Satdreamgr and attempted to watch # 2 or any of the 6 mkv files, but they would not play correctly (audio ok but video is black).

Multibooted to ATV 6.0 with out updating to the latest and same results, it did not play video, but audio ok.

Multibooted to ATV 5.3 with same results.

Tried all six files on my pc again, and they played fine as they did three weeks ago.

Strange that the first file would play correctly and then all subsequent files in the series would crap out. Wonder if hdmi encryption is the culprit.

Will test again in a few days.