from your description it looks like that the "Switch User" didn't bring you to the gdm login dialog but to the gnome-screensaver unlock dialog, can you confirm that? Could you try to run "gdmflexiserver --startnew" from a command line and note to a comment if it works and what it's printing?
-- [feisty] When automatically logged in, cannot switch to other user https://launchpad.net/bugs/83283 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
