when I open up a second or third window, it freezes the screen

[ginnyh532]

gnome-settings-daemon is not sending out any error messages on my computer. However, when I try to switch focus to a new window, the screen freezes. Sometimes, I can get it to respond by right clicking a menu. Otherwise, I have to reboot. Two days ago, this probem was fixed. It has now come back to haunt me.

I am using Precise (Ubuntu 12.04).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-settings-daemon 3.4.2-0ubuntu0.2
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic-pae 3.2.19
Uname: Linux 3.2.0-26-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu8
Architecture: i386
Date: Sat Jul 14 20:12:13 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-settings-daemon
UpgradeStatus: No upgrade log present (probably fresh install)