Damn, I can't imagine what it is then. I'm good about updating drivers, svc pks, defragging, etc. Anyhoo, I've ordered P5 & it should be here within the week. I've wanted to step up to the new version since it's release & now is as good a time as any, I suppose. As a side note: After ordering P5, I spent nearly six hours working in P4 last night & experienced no problems. Go figure. Thanks to all for the assist. Happy Rendering.