Application that crashed: systemsettings
Version of the application: 1.0
KDE Version: 4.3.1 (KDE 4.3.1) "release 6"
Qt Version: 4.5.3
Operating System: Linux 2.6.31.5-0.1-default x86_64
Distribution: "openSUSE 11.2 (x86_64)"

What I was doing when the application crashed:
1. Start System Settings.

2. Inside there, open the Desktop window.

3. Inside there, activate the Screen Saver subwindow.

4. The crash should now happen.

I don't know how to get information about KWin compositing mode and so on.

 -- Backtrace:
Application: Systemeinstellungen (systemsettings), signal: Segmentation fault
[KCrash Handler]
#5  0x00007f08917067c0 in XVisualIDFromVisual () from /usr/lib64/libX11.so.6
#6  0x00007f0893d560ff in ?? () from /usr/lib64/libQtGui.so.4
#7  0x00007f0893d56190 in ?? () from /usr/lib64/libQtGui.so.4
#8  0x00007f0893d5da56 in QWidgetPrivate::create_sys(unsigned long, bool, bool) () from /usr/lib64/libQtGui.so.4
#9  0x00007f0893d2431b in QWidget::create(unsigned long, bool, bool) () from /usr/lib64/libQtGui.so.4
#10 0x00007f088461361a in KSWidget::KSWidget (this=0xebf7d0, parent=<value optimized out>, wf=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.1/kcontrol/screensaver/kswidget.cpp:66
#11 0x00007f0884605581 in KSSMonitor (parent=<value optimized out>, this=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.1/kcontrol/screensaver/kssmonitor.h:9
#12 KScreenSaver::slotPreviewExited (parent=<value optimized out>, this=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.1/kcontrol/screensaver/scrnsave.cpp:607
#13 0x00007f0884607730 in KScreenSaver::findSavers (this=0xe53420) at /usr/src/debug/kdebase-workspace-4.3.1/kcontrol/screensaver/scrnsave.cpp:575
#14 0x00007f08846080dc in KScreenSaver::qt_metacall (this=0xe53420, _c=InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffcb1063c0)
    at /usr/src/debug/kdebase-workspace-4.3.1/build/kcontrol/screensaver/scrnsave.moc:98
#15 0x00007f089316efbc in QMetaObject::activate (sender=0xe892d0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x6483b0) at kernel/qobject.cpp:3113
#16 0x00007f0893168f63 in QObject::event (this=0xe892d0, e=0x1) at kernel/qobject.cpp:1075
#17 0x00007f0893cd42ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#18 0x00007f0893cdb57e in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#19 0x00007f08948ce8d6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#20 0x00007f0893159ddc in QCoreApplication::notifyInternal (this=0x7fffcb106e00, receiver=0xe892d0, event=0x7fffcb106a00) at kernel/qcoreapplication.cpp:610
#21 0x00007f089318571d in sendEvent (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#22 QTimerInfoList::activateTimers (event=<value optimized out>, receiver=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:594
#23 0x00007f0893182678 in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#24 idleTimerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#25 0x00007f08900c3dde in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#26 0x00007f08900c77a8 in ?? () from /usr/lib64/libglib-2.0.so.0
#27 0x00007f08900c78d0 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#28 0x00007f08931823a3 in QEventDispatcherGlib::processEvents (this=0x617430, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#29 0x00007f0893d6731e in ?? () from /usr/lib64/libQtGui.so.4
#30 0x00007f0893158712 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#31 0x00007f0893158ae4 in QEventLoop::exec (this=0x7fffcb106d50, flags=) at kernel/qeventloop.cpp:201
#32 0x00007f089315ac99 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#33 0x000000000040cbd9 in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.3.1/systemsettings/app/main.cpp:51

Reported using DrKonqi