I have the licensed copy of JAP Region KOF XI and when I go to the online option, the screen flashes and it goes to the "not a valid ps2 disk" screen. I have even tried to back up my game just in case and still no success. I am using swap disk on a USA ps2. I had the same problem with Metal Gear Solid 3 Online Back up. It really puzzles me that the actual game still doesnt work!?! Any ideaS?