Just a heads up that once again an xorg update has removed the link in /usr/lib64/xorg/modules/extensions that points to libglx.so.325.15 in /usr/lib64/xorg/modules/extensions/nvidia thus breaking X. This should only effect those with nvidia proprietary driver. One of the following packages is the culprit but I have not tried to narrow it down. I have done updates and downgrades several times and it is quite reproducible.
Oct 15 17:53:01 Updated: xorg-x11-server-common-1.13.0-11.1.el6.centos.1.x86_64 Oct 15 17:53:03 Updated: xorg-x11-server-Xorg-1.13.0-11.1.el6.centos.1.x86_64 Oct 15 17:53:03 Updated: xorg-x11-drv-mga-1.6.1-8.el6_4.x86_64 Oct 15 17:53:04 Updated: xorg-x11-drv-synaptics-1.6.2-11.el6_4.1.x86_64 Oct 15 17:53:04 Updated: xorg-x11-drv-mach64-6.9.3-4.1.el6_4.x86_64
Cheers, B.J.