See: https://bugs.freedesktop.org/show_bug.cgi?id=18229
dbus-1.2.6-1.fc10 has been submitted as an update for Fedora 10. http://admin.fedoraproject.org/updates/dbus-1.2.6-1.fc10
dbus-1.2.6-1.fc10 has been pushed to the Fedora 10 stable repository. If problems still persist, please make note of it in this bug report.
dbus-1.2.6-1.fc9 has been pushed to the Fedora 9 stable repository. If problems still persist, please make note of it in this bug report.
This version of dbus messes up everything: gpk stops working, system-config-services stops working, system-config-printer stops working, and more. Seems like some default policy were changed, and the corresponding system components were not tweaked. Refer to this link: http://forums.fedoraforum.org/showthread.php?t=206797