I upgraded some packages and rebooted to a new kernel, since then I do not get the warning anymore when I open the Theme dialog.
Running gnome-settings-daemon from the console still gives me: [EMAIL PROTECTED]:~$ gnome-settings-daemon You can only run one xsettings manager at a time; exiting [EMAIL PROTECTED]:~$ -- gnome-settings-manager unable to start after breezy->dapper upgrade https://launchpad.net/bugs/43429 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs