Clicking "Lock/switch Account" has no effect

[jeremy-list]

To replicate: click the icon on the top-right of the screen in unity, then click "Lock/Switch Account" on the menu that appears.
What should happen is: the login screen should reappear
What actually happens is: absolutely nothing.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity 7.0.0daily13.06.19~13.04-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-30.44-generic 3.8.13.6
Uname: Linux 3.8.0-30-generic i686
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,move,place,imgpng,grid,vpswitch,snap,mousepoll,gnomecompat,unitymtgrabhandles,regex,resize,session,animation,wall,workarounds,fade,expo,scale,ezoom,unityshell]
Date: Mon Aug 26 23:40:56 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2011-08-09 (748 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_NZ:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_NZ.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to raring on 2013-08-26 (0 days ago)

[Andrea Azzarone (azzar1)]

13.04 is no longer supported. Is this still a problem on 12.04/14.04/14.10?

[Launchpad Janitor (janitor)]

[Expired for Unity because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for unity (Ubuntu) because there has been no activity for 60 days.]