I've successfully modded my Saturn, and I also got the AR 4M Plus cartridge. Nearly every backup I've tried to play has worked perfectly. However, I tried playing Marvel Super Heroes vs Street Fighter (J) and it won't boot. The AR menu boots up, I go to start game without codes, and I get the LOADING window, but the game never starts. I know Marvel Super Heroes vs Street Fighter, and its counterpart X-Men vs Street Fighter (which I'm also going to get) require the 4MB expansion. I couldn't find a way to switch between 1MB and 4 MB on my AR cart. I just tried the region patching program SRP (v3.0 Gold Edition) and it doesn't even recognize the game. Is there's some unusual way this game needs to be burned?