signon-ui crashed with SIGABRT in raise()

[lostprophet]

at first the pc didn't start the xserver.

after getting the newest updates, xserver started, but i couldn't login. even though the password was correct, i always got back to the login-screen.
stopping and starting lightdm helped...

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: signon-ui 0.10-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-15.22-generic 3.5.4
Uname: Linux 3.5.0-15-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.5.2-0ubuntu4
Architecture: amd64
Date: Mon Sep 24 08:23:13 2012
ExecutablePath: /usr/bin/signon-ui
ProcCmdline: /usr/bin/signon-ui
Signal: 6
SourcePackage: signon-ui
StacktraceTop:
 raise () from /lib/x86_64-linux-gnu/libc.so.6
 abort () from /lib/x86_64-linux-gnu/libc.so.6
 ?? () from /lib/x86_64-linux-gnu/libc.so.6
 ?? () from /lib/x86_64-linux-gnu/libc.so.6
 ?? () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
Title: signon-ui crashed with SIGABRT in raise()
UpgradeStatus: Upgraded to quantal on 2012-09-21 (2 days ago)
UserGroups:

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1053351, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.