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How much system memory do you have on the machine? Also, does it occur when you have a few other applications running in other windows? It could be a low memory condition such that the display cannot be repainted fast enough. Try NOT to run any other apps while Pro/E is running.
I've also seen where bugs in 3D CAD apps in how they handle the graphics display. See if your version of Pro/E has options for configuring how it handles display buffering. We'll see if we can find out anything on it.