> Have you tried using software rendering via Mesa rather than xorg-intel?

not on this machine (it's a new one, I haven't done many experiments yet)
>
> Do you use any other OpenGL software on a regular basis?
>
I guess yet. compiz (except when running another opengl application; they 
don't mix well). Also, I play armagetronad quite a bit :-)
And of course, my own small ocaml software...

Have you experimented with glcaml ? I was tempted to give it a try.