Does setting _SCREEN.Themes=.F. fix the problem?

>I just recompliled my app from 7.0 to 8.0 and have been using it a little while. I'm having an interesting thing happen. If another App window overwrites my app, i.e., internet explorer, word, etc. my main window goes blank, and only as I move the mouse around do objects reappear. I can also min/max etc. and the objects are reappearing...
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>Does anyone know what's causing this...and what do I do about it?
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>(I'm running Windows XP SP2.)
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>Bob