I can tell you this issue is NOT OpenGL related. Python uses the standard GDI to draw windows, in the end, everything that does something on screen without using DirectX or OpenGL uses standard GDI - even Java/Swing. So it might be a Tkinter problem, or even a Windows problem. What Windows version do you use? And when was the latest reinstall? I reinstall Windows XP Pro from the ground up on a fairly regular basis, about once every 6 months on my development machine, once a year on my rendering machine. Windows gets corrupted over time. Sad but true.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

My gallery   My freestuff