When I try to reproduce this I can log back in as user aaaaaa or user bbbbbb depending on the user name box? This is desired behaviour as you probably want to join aaaaaa's session again.
is this what happens for you? -- Lock Screen/Switch User can't use https://launchpad.net/bugs/55575 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
