Hi. I started to download some .mkv videos and as soon as I got the first one I opened it with VLC media player and it worked just fine. So I closed it and went to do something else. When I got back I tried to open the same file again and this time VLC would open but the video wouldn't even start. I tried downloading codecs and the latest version of VLC but nothing helped. After dinner I tried opening the file again and this time it worked, and it still works if I close and reopen the file, but it doesn't work on the other videos! VLC just opens and stays blank. DivX and WMP straight up tell me they can't run the file. Any ideas?