I recently ran the "Create MAME Videos" program from the GameEx folder and now have a bunch of .mng's in my MAME folder. The thing is, in GameEx, snaps for games just show up as a black screen - no video or even still image - just a black square. I've tried putting the .mng's in my avisnap folder and the regular snap folder but in both cases it is just black. How do I fix this? Normal .png's from screenshots that I took by hand show up fine in GameEx.