Messed up colors when playing WoW

[Malivar]

Whenever I play World of Warcraft for more than 45 minutes, sometimes less, the colors of my entire UI (including the entire iMac OSX UI) changes drastically and becomes distorted. Any ideas what this might be? This is something that doesn't always happen to me, it happened more in the past, but has for some reason returned to haunt me.

Picture of screen once warped:
http://img703.imageshack.us/img703/8213/img0317l.jpg (1600x1200)

 

[Vladimur]

I would delete your WTF folder. if the problem persists, reinstall WoW. If the problem happens outside of WoW, contact Apple?

Hope this helps!