unity-2d-launcher crashed with SIGSEGV in QMetaObject::changeGuard()

[newuser]

Binary package hint: unity-2d

Unity-2d launcher crashed after I opened vlc or synaptic, I don't know wich caused this problem.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: unity-2d-launcher 3.8.1-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
CrashCounter: 1
Date: Thu Apr 7 19:53:27 2011
ExecutablePath: /usr/bin/unity-2d-launcher
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta 1 i386 (20110329.1)
ProcCmdline: unity-2d-launcher
ProcEnviron:
 LANGUAGE=fr_FR:en
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x109d6d1 <_ZN11QMetaObject11changeGuardEPP7QObjectS1_+305>: mov 0x4(%eax),%eax
 PC (0x0109d6d1) ok
 source "0x4(%eax)" (0x3c0b3ca2) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: unity-2d
StacktraceTop:
 QMetaObject::changeGuard(QObject**, QObject*) () from /usr/lib/libQtCore.so.4
 LauncherApplication::setBamfApplication(BamfApplication*) () from /usr/lib/qt4/imports/UnityApplications/libUnityApplications.so.1.0.0
 LauncherApplicationsList::insertBamfApplication(BamfApplication*) () from /usr/lib/qt4/imports/UnityApplications/libUnityApplications.so.1.0.0
 LauncherApplicationsList::onBamfViewOpened(BamfView*) () from /usr/lib/qt4/imports/UnityApplications/libUnityApplications.so.1.0.0
 LauncherApplicationsList::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/qt4/imports/UnityApplications/libUnityApplications.so.1.0.0
Title: unity-2d-launcher crashed with SIGSEGV in QMetaObject::changeGuard()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (nautilus:1727): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed
 (nautilus:1727): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed
 (nautilus:1727): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed
 (nautilus:1727): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed
 (nautilus:1727): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed