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    Question Winform app in Windows XP display issues, fine in Vista or 7

    I have a winforms app that I wrote on a Windows 7 box. It uses a double buffering for speed, gradient that it paints on the back of a tabpage, lots of DataGridView, and some rectangles (solid filed) for display. When the app runs on a Windows Vista or Windows 7 box it runs fine, but running on...