My application has several windows and some of them does not redrawn properly after other windows obscured them. It happens on some of my PCs (Windows XP). (1 out of 10).
I draw the picture using front buffer only.
I think there is some ralations between my flush(glFlush()) and screen refresh rate.
If I put time dalay, it seems working fine.
Any idea for the problem will be very much appreciated.
-KB