Anyone have any problems or wierd occurences with users running VFP6 exe's under Win2K?

I have a couple users on Win2K that have things happening that I can't recreate on NT and other users, on Win 95 & 98, don't have happening. One thing is the user starts a form, but it just flashes and closes. They start it again and it works fine. This doesn't happen all the time but enough and never happens to anyone on 95, 98 and NT.

Any thoughts?