Game Problem: Glitch in Pokemon Sapphire?

I'm using the No$gba Gameboy Advance emulator and I'm playing Pokemon Sapphire. When I get to the Rusturf tunnel I walk in and it seems like there's a glitch, because it looks like a fog texture map or something, because I can't see anything but white/gray fog moving from right to left on the screen. When I walk around in the tunnel and encounter a wild pokemon and the screen flashes and switches to battle, I can see the tunnel - but only then. Has anyone else encountered this/gotten a solution to this problem?

I just tried a diff version of pokemon sapphire and same thing happens at Rusturf. So, problem is narrowed down to two things: Op system (Vista home premium) or the emulator. Anyone have any thoughts?

Okay, just tried it with Windows 7 and still at Rusturf tunnel it's a fog moving texture map and I can't see crap. http://www.youtube.com/watch?v=qeKWbd7fDtY&feature=related
You see the fog? that's all I see. I don't see the tunnel itself. Just stark white fog. Anyone have ANY input whatsoever?

get dsmume, no$gba sucks...
http://desmume.org/