SOLVED
I ran into this shortly after updating 9.10, got the black box in place of 
login screen, following log messages in /var/log/gdm/:0-greeter.log

(gnome-settings-daemon:3419): GLib-CRITICAL **: g_propagate_error:
assertion `src != NULL' failed

(gnome-settings-daemon:3419): GLib-CRITICAL **: g_propagate_error: assertion 
`src != NULL' failed
Window manager warning: Failed to read saved session file 
/var/lib/gdm/.config/metacity/sessions/10a9a99fd3e4ce7c9b128608721774271800000034130008.ms:
 Failed to open file 
'/var/lib/gdm/.config/metacity/sessions/10a9a99fd3e4ce7c9b128608721774271800000034130008.ms':
 No such file or directory

/etc/motd told me system load was over 5, saw 4-5 gdm processes each
eating 15-27% cpu.

I figured it was a faulty update, possibly of my evil binary nvidia
driver.  Turns out /tmp was full!  Clearing it solved the problem.

-- 
GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
https://bugs.launchpad.net/bugs/384439
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