Please attach your /etc/X11/xorg.conf file and /var/log/Xorg.0.log. There is a possibility that rather than be a nvidia issue, this could simply be another case of bug 3731.
Please attach your /etc/X11/xorg.conf file and /var/log/ Xorg.0. log. There is a possibility that rather than be a nvidia issue, this could simply be another case of bug 3731.