Seriously -- it's an illusion. Do this -- put a piece of cardboard or something else opaque over the screen so that all you can see is one of the black bars. Then watch it during the fade.
Buuuuut . . . if for some reason it DOES fade, it doesn't have anything to do with what you do in Vegas, because those bars are generated by the DVD player, so the problem would lie in either the player or the TV.
Buuuuut . . . if for some reason it DOES fade, it doesn't have anything to do with what you do in Vegas, because those bars are generated by the DVD player, so the problem would lie in either the player or the TV.