Action Replay 4M Plus

My friend loaned me his Action Replay 4M Plus. I can't get it to work properly with Marvel Vs. Streetfighter. I can get the cart to boot to the cheat menu, so I know that the cart is working, but when then it freezes. this is with the orignal Japanese cd. When I play with an iso of the game that I converted to USA, the game boots, but it goes to a screen, which I assume to be saying "This game requires the 4M cart." I also have the original 4meg cart, the blue one, and it works. any suggestions? I'm about to open up this mofo and play around.

Here's a picture of the cart I have from the message baord:

Ok this gets weirder, X men vs streetfighter works fine, but Marvel vs streetfighter doesn't.