It looks like the problem was narrowed down later in the email thread mentioned above. See:
I'm seeing the same problem trying to run Quake4 with the updated linuxolator on a 7.1-PRERELEASE system running the 177.80 NVidia binary drivers. I'm trying to get some usable ktrace/linux_kdump logs for review. Please let me know if there is any other information that might help track down this problem.