I keep getting a crash report saying Xorg has crashed. It usually happens when I log in, but sometimes occurs afterwards. When I get the crash, nothing appears to be having trouble, so the first couple times I ignored it. I am running Ubuntu 12.04 amd64 with xorg package "xserver-xorg-core 2:1.11.4-0ubuntu10.1"
In the bug report 973096, someone suggests to "just remove the Nvidia driver and use the standard nouveau driver until this bug is fixed".