OpenGL viewport redraw problem

I hava a OpenGL viewport redraw problem, I’m not sure where the problem is coming from.

I have a nVidia Geforce 6600 card, latest drivers, running Windows XP, and display is usually
set at 1024x768x32, but I tested it at lower resolutions and the problem still happens. When
I open up the main menu in my OpenGL app, it drops down and covers part of the OpenGL viewport,
which is ok, but when I close it, part of the menu is still being drawn on the viewport.
It doesn’t happen all the time, but it is annoying.

All viewports are double-buffered, and playing around with glFlush,glFinish doesn’t seem to help.

Ay suggestions?

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