Comment 1 for bug 278306

this is the case in both gnome 2.22 and 2.24.

I used nvidia-settings for the configuration.
Xinerama is disabled.

I attached my xorg.conf

my video driver is:
nvidia-glx-173:
  Installed: 173.14.12-1-0ubuntu3
  Candidate: 173.14.12-1-0ubuntu3
  Version table:
 *** 173.14.12-1-0ubuntu3 0
        500 http://ftp-stud.fht-esslingen.de intrepid/restricted Packages
        100 /var/lib/dpkg/status

there is a upstream bugreport here:
http://bugzilla.gnome.org/show_bug.cgi?id=553178