Having the same problem also. Ubuntu 9.10 64-bit, nvidia-185.18.36-0ubuntu9, 2.6.31-19.56 generic kernel.
[266335.113090] compiz.real[2473]: segfault at 8 ip 00007fc4df2fc583 sp 00007fffe65953e0 error 4 in libGLcore.so.185.18.36[7fc4de80a000+dda000]
[271536.464872] compiz.real[693]: segfault at 8 ip 00007fbd1c6ff583 sp 00007fff8d5144b0 error 4 in libGLcore.so.185.18.36[7fbd1bc0d000+dda000]
Having the same problem also. Ubuntu 9.10 64-bit, nvidia- 185.18. 36-0ubuntu9, 2.6.31-19.56 generic kernel.
[266335.113090] compiz.real[2473]: segfault at 8 ip 00007fc4df2fc583 sp 00007fffe65953e0 error 4 in libGLcore. so.185. 18.36[7fc4de80a 000+dda000] so.185. 18.36[7fbd1bc0d 000+dda000]
[271536.464872] compiz.real[693]: segfault at 8 ip 00007fbd1c6ff583 sp 00007fff8d5144b0 error 4 in libGLcore.