Hey guys. So, I'm having some issues all of a sudden playing mkv files on several external hard drives. Basically, whenever I try to play an mkv now, it looks like it tries to play it but I get a black screen and the time bar for the video file says 0:00:00/0:00:00. I am using firmware 1.02.21-5.1.1. I'm using this version because it's needed for a particular moviesheet. This just started occurring today. Yesterday, everything worked just fine. I did NOT change anything in between yesterday and today. I tried the newest WD firmware and the files play just fine. I tried reloading from scratch 1.02.21-5.1.1 but have had no good results. VERY occasionally, I'll be able to play a file but not any more. Anyone have any ideas?