I have been playing Alien 3 rom, 'Alien 3(UE)(REV01)[!].zip' from a goodgen collection, and have notice that if you leave the attract sequence running after about the 4 or 5 repeat the game locks up and has red jailbars going down the screen, also when you get onto stage 4 there seem to be gfx glitches with the background now and again. Any ideas on these problems?? Should point out my Megadrive II is 50/60hz modded