I can playback MKVs fine but none of the applications that I've tried (licensed copies of PowerDVD Ultra 11, DIVX, MM4 beta, and Nero Ultra 11's player, plus MPC) played the DTS-HD track. I've tried FFDShow codecs and the codec from matroska.org on two completely different PCs. I liked the idea of getting rid of previews and ads but I mostly care about having my concert videos on tap and they don't have much if any of the junk. My main goal for this box was better playback of 24bit HD and multichannel FLACs, better access to online content and playback of DTS-HD content. All of that works. I've got way too many
10s of hours into the secondary goal of trying to get MKVs to work so that I can strip out the junk.
Never fear my innate stubborn drive to troubleshoot and solve any challenge placed before me will eventually force me to learn something about audio and video processing but for now it's over my head and I have a huge learning curve ahead of me. I realized that when a tech/developer started asking me about MakeMKV and b-frames vs p-frames
and I'm not ready to get a PhD in Handbrake which stubbornly insists on taking a 25GB video and shrinking it to 2TB. ISOs are working really well and hard disks are cheap.