SDL_OPENGL problem

Hi,

after SDL’ing one of my OpenGL codes I encountered a problem: the window turned to an
amber color and the system slowed down remarkably (bad windows/event response).

NeHe’s SDL-fixed tutorial source codes cause the same problem, but only from tutorial
source-code 5 to 12. The others (2, 3 and 4) are running nicely. There seems to be
a problem with the complexity of the GL calls per frame, but I didn’t find it, yet.

Did anyone encounter a similar phenomenon?

Boris

PS:
My setup:
Win32, DirectX7, Diamond Viper 550 (NVidia TNT)
SDL 1.1, OpenGL/GLUT both most recent versions