Comment 7 for bug 450263

Well, I can assign this to the -ati driver in Ubuntu, that's still an Ubuntu bug. What I meant when talking to the Mono.XNA developers was that you should try to pin-point the problem with them.

You have the following layers going on:
1) Your code (non-Ubuntu)
2) Mono.XNA (non-Ubuntu)
3) libtao (Ubuntu)
4) Mono (Ubuntu)
5) OpenGL (Ubuntu)
6) ATI drivers (Ubuntu)

Basically #6 is not going to want to spend a lot of time diagnosing your problem unless you can give them a test case that eliminates some of the layers. Still, if it's an Ubuntu bug, then this report should stay open.

Have you tried testing your game on a different PC with an ATI card?