I think what faeran was saying is that the MAME team themselves have changed the rom filename, so if Emumovies still has their video file named as the old rom filename, then it won't show up if you have one of the new rom file names. I myself have a very old MAME romset, so if this is something that has happened within the last 5 years or so, my video files would still be named after old rom file names.