systemsettings crashed with QComboBox.addItem(QIcon, QString, QVariant userData=QVariant()) in reinit()

Binary package hint: kdebase-workspace

systemsettings crashes always Kubuntu is initializing.

ProblemType: Crash
DistroRelease: Ubuntu 10.10
Package: systemsettings 4:4.5.0-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-14.19-generic 2.6.35
Uname: Linux 2.6.35-14-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue Aug 3 16:17:11 2010
ExecutablePath: /usr/bin/systemsettings
InstallationMedia:

ProcCmdline: /usr/bin/systemsettings -caption System\ Settings -icon preferences-system
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kdebase-workspace
Title: systemsettings crashed with QComboBox.addItem(QIcon, QString, QVariant userData=QVariant()) in reinit()
UserGroups: adm admin cdrom dialout fax floppy libvirtd lpadmin plugdev sambashare syslog
XsessionErrors:
 (process:2755): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (operapluginwrapper-ia32-linux:3156): Gtk-WARNING **: /usr/lib/gtk-2.0/2.10.0/engines/libqtcurve.so: wrong ELF class: ELFCLASS64