Ultimate Alliance PS2 Problem

Hello all Vimm's Vault users! I have a simple plea: Marvel's Ultimate Alliance for the PS2's ROM/ISO doesn't appear to function with PCXS2. I extracted the file to my ROMS folder like every other game from Vimm's Vault, yet it gets to a loading screen then crashes. This is the only game to do so. Any help would be appreciated, and if the issue is with the ISO file I hope it is fixed soon as it's one of my favorite childhood games. "Umm...Lemons. Yeah, Lemons"