Make sure that you have the recent drivers installed. This page has a link to information about drivers for OpenGL cards.
You're not missing much if you don't use OpenGL in After Effects. The OpenGL renderer is a low-fidelity preview renderer, and it often causes problems. Most people leave it off except for the OpenGL - Interactive setting for previews.
I updated my post to report that it was only previews that are not available to be set. Photoshop and the rendering funtion in AE are both working.
Sounds like some front buffer/ back buffer thing and OpenGL being unable to set a screen/ window context for the drawing. At what resolution do you run? Multiple monitors? How are they connected?
It doesn't matter if it's 1/4, 1/2, 3/4, Full, Auto. They all don't allow me to enable OpenGL. In the Previews dialog, Adaptive Resolution Limit is set to 1/4. Did I mention I'm using this with Dynamic Link with PP CS4?
BTW, my drivers and AE are up to date.
Thx for your help.
Did I mention I'm using this with Dynamic Link with PP CS4?
In that case Premiere Pro's routines may take priority for footage decoding and disable AE's OpenGL. Otehr than that you haven't realyl answered my question, so I'm not sure what else to say...
Oh, sorry. I run at 1920x1080 on only one monitor connected to the video card. I think that's all you asked.