Might not help much but i have had problems with the Maya and the latest version of the Radeon drivers, have you tried downgrading the driver. I'd look up the version I'm using but I'm on my linux box atm so it ain't going to do you a lot of good.
Good luck
Dave 
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"