Has anyone else experienced this issue?When using OpenGL when using a Steam app, there is a constant flickering anomaly.Switching over to Direct3D works smoothly with no performance issues.

no didnt have this problem but every time i had a map change in css my system locked up and req a reboot

I don't think CS:S uses OpenGL, though. Source Engine games use DirectX instead.I had the same problem with OpenGL and GoldSrc games. The onlyway I could fix it was to switch to DirectX mode.