abrt version: 1.1.17
architecture: x86_64
Attached file: backtrace, 9151 bytes
cmdline: /usr/bin/Xorg :0 -background none -verbose -auth /var/run/gdm/auth-for-gdm-1AGolP/database -nolisten tcp vt1
comment: After updating my F-15 system to the latest packages in updates-testing, login to the desktop, and attempt to change the desktop background using the GNOME control-center.  This causes X to segfault.
component: xorg-x11-server
Attached file: coredump, 25280512 bytes
crash_function: OsAbort
executable: /usr/bin/Xorg
kernel: 2.6.38-0.rc6.git6.1.fc15.x86_64
package: xorg-x11-server-Xorg-1.9.99.1-6.20101201.fc15
rating: 4
reason: Process /usr/bin/Xorg was killed by signal 6 (SIGABRT)
release: Fedora release 15 (Lovelock)
time: 1298985591
uid: 0

How to reproduce
-----
1. Update system to F-15 content from updates-testing
2. Login to GNOME desktop (gnome-shell)
3. Open control-center background settings by clicking on top-right panel icon
3. Change the background by selecting the gnome-shell stripes