ok this is a stretch, but have you checked your drive for errors? If you are using that many pixels, there's a chance that you're using a lot of VM space, and if you are hitting a bad / mis-allocated sector, then it might account for the problem. Also, are you rendering under 95/98 or NT? 95 and 98 manage memory very poorly, so there is a chance that this is producing the error. Good luck- Brent