On my device some (only few) MKV-files can be played, most not. I am using GTVBox (Movies via WiFi played from NAS), but I also tested with the native player via USB-HD connected directly to NSZ-GS7. Results were identical. FW is updated to latest version. I read in several websites that NSZ-GS7 is supposed to play MKV natively. What is the reason for that? What can I do about it? Is it normal or am I the only one having this problem? PS: Plex is not an option, since I do not want to run a server.