I was able to get this bug again on an other machine. On my laptop I have a fresh install of Xubuntu. I installed Ubuntu with sudo aptitude install ubuntu-desktop. During the install several dependency problems arouse. I continued with the installation, logged out of Xubuntu and tried to login to Gnome. Then the same error appeared: long wait, blue screen, grey box on the top left corner, etc.
-- gnome-settings-daemon crashes at login https://launchpad.net/bugs/61381 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs