>On one of my projects I set it to 800 X 600. It won't stay; everytime I restart Fox, it defaults back to 640 X 480. I have deleted foxuser and everything else I can think of. Anyone know if there is a project property that can be set to force this? I can't find any documentation on the maximum design area that describes how (or where) it is stored.

Have you checked out Tools->Options->Forms-> Maximum design area?