I recentally upgraded to 9.10, and on doing so, when I rebooted, it had me enter my encryption passphrase, it seemed to boot fine, until it got to where the login screen should be showing. It flickered a lot, and only showed the command line login screen. Whenever it was flickering it would not let me type. Could this be a problem with GDM trying to start but cant? When I rebooted to the 2.6.18 kernel, it worked perfectly.