I support an app that uses openGL/GLUT for Mac, Windows and Linux. On some ATI cards, our users are reporting problems that upon restoring the openGL window, after minimizing to the taskbar, the openGL window is not being redrawn. I can reproduce a variant of this bug on a laptop using an ATI driverfrom *gulp* 2001.
So, to reproduce the problem: just minimize the window and then try to restore it. It is not redrawn.
Any suggestions on what could be the problem?