Anyone with an ATI graphics card that is not recognised for OpenGL drawing in PS CS4 I just got mine working after weeks of trying. Catalyst Control panel/3d settings/all/opengl/enable triple buffering. Presto, my card was recognised and works perfectly in PS CS4. Just thought I would mention it in case it helps anyone else with a similar problem.
More aboutopengl recognised
How all the rest of the settings? I have CS4 on win7x64, and same problem with 5750 card, but setting triple buffering had no effect.
So please list ALL the settings - might be some combination.