I've gotten those types of glitches before, especially the numbers across the top of the render. Never quite figured out what caused them, but I suspect it has to do with your video card/driver. It used to happen often when I had a video card in that wasn't specifically designed for Vista. It was a much better video card, but caused all kinds of problems in Vista, so I got a new one and have not seen those type of problems again. The numbers across the top of the screen seemed to happen the most and more often when I tried to do something else while it was rendering.

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