I have two Windows 7 64 bit systems. I recently upgraded both of them to K-Lite Mega 15.1.4 with no errors. I have VLC 3.0.8 on one, and 3.0.3 on the other. The system with 3.0.3 plays MKV files with VC-1 video, the 3.0.8 does not. The one with 3.0.8 had an earlier version (probably 3.0.6) and also did not play VC-1 video.
I suspect the problem is not in VLC, but I can't find another place to look. I did a complete re-install of K-Lite Mega, Avidemux can open and play the video files (and says it's using lavcodec) which means the codec is present on the system and working, so I can't figure out why VLC only plays audio and not video.
Any suggestions on where to look?