3.3E with D2pro installed. When ssbb came out in japan I played the dvd 9 version up untill recently however my laser is starting to die so I started using the dvd 5 PAL release. Chucked in the pal disc, started up the game and an error came up (system files corrupt) on a black screen. Reset the wii and before it got to the menu again the (system files corrupt) message appeared on the screen. However when I took out the disc it loaded to the menu fine... Replaced the disc and the game worked fine. Just wondering what could cause this? Any known errors and has it happened to anyone before.