Cannot log back in after switching user account

[Andrew]

If I click 'Switch User Account...' in Unity's menu at the top of the screen, I am taken to the LightDM login screen. When I type in my password and press Enter, instead of returning me to my Unity session, the password text field on the login screen disappears. Nothing I can type or click will return me to my Unity session.

If I press Ctrl+Alt+F8 I am taken to the 'Lock Screen' password prompt and can log back in to my session, but after doing this my network connection is inactive, and my only option is to reboot to restore it.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: lightdm 0.9.7-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
ApportVersion: 1.23-0ubuntu1
Architecture: amd64
Date: Fri Sep 23 12:27:53 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
SourcePackage: lightdm
UpgradeStatus: Upgraded to oneiric on 2011-09-23 (0 days ago)
mtime.conffile..etc.lightdm.users.conf: 2011-09-23T08:46:55.039175

[Sebastien Bacher (seb128)]

Thank you for your bug report, do you get the issue every time?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[ninebelow (jared-7)]

I am having a similar problem with 11.10 and user switching. I seem to be missing the switch user menu option which is sorely missed, but if I lock the screen and then switch users and try logging in as another user after entering the password it does not start a session and I end up having to Ctrl-Alt-F2 and rebooting the system using command line.

[Rüdiger Kupper (ruediger.kupper)]

Please check if this is really a duplicate of bug #851612.
I do not experience a black screen and blinking cursur, as described there. Instead the password prompt on the lightdm screen disappears, but nothing else happens.