Please see https://bugs.edge.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/197153 for the bug. The attached patch just adds a NULL pointer check that is needed to fix this. Thanks, James
Created attachment 303690 [details] Patch to add NULL pointer check
Patch has been sent upstream (see http://mail.gnome.org/archives/gnomecc-list/2008-April/msg00009.html) I feel this is blocker-worthy - assuming the patch is correct it's an easy fix, and it's a crasher in a visible F9 feature (http://fedoraproject.org/wiki/Features/RandrSupport).
Thanks, ssp said he'd look at the collected Ubuntu patches later today.
Confirmed - this patch is in gnome-desktop-2.22.1-3.fc9.