Version:           unknown (using KDE 3.3.0, SuSE)
Compiler:          gcc version 3.3.3 (SuSE Linux)
OS:                Linux (i686) release 2.6.5-7.104-default

Sometimes, when I switch from kmail to knode, kontact crash. The text information obtained from crash dialog is:

Using host libthread_db library "/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 1099560416 (LWP 7356)]
[New Thread 1128745904 (LWP 10637)]
[Thread debugging using libthread_db enabled]
[New Thread 1099560416 (LWP 7356)]
[New Thread 1128745904 (LWP 10637)]
[Thread debugging using libthread_db enabled]
[New Thread 1099560416 (LWP 7356)]
[New Thread 1128745904 (LWP 10637)]
[New Thread 1126644656 (LWP 10636)]
[KCrash handler]
#7  0x4082b8d1 in KXMLGUI::ActionList::unplug ()
   from /opt/kde3/lib/libkdeui.so.4
#8  0x40879e5c in KXMLGUI::ContainerNode::unplugClient ()
   from /opt/kde3/lib/libkdeui.so.4
#9  0x4087a1b5 in KXMLGUI::ContainerNode::unplugActions ()
   from /opt/kde3/lib/libkdeui.so.4
#10 0x4087a23c in KXMLGUI::ContainerNode::destruct ()
   from /opt/kde3/lib/libkdeui.so.4
#11 0x4087a433 in KXMLGUI::ContainerNode::destructChildren ()
   from /opt/kde3/lib/libkdeui.so.4
#12 0x4087a230 in KXMLGUI::ContainerNode::destruct ()
   from /opt/kde3/lib/libkdeui.so.4
#13 0x4091ef67 in KXMLGUIFactory::removeClient ()
   from /opt/kde3/lib/libkdeui.so.4
#14 0x401a637c in KParts::MainWindow::createGUI ()
   from /opt/kde3/lib/libkparts.so.2
#15 0x08060aee in Kontact::MainWindow::slotActivePartChanged ()
#16 0x08063384 in Kontact::MainWindow::qt_invoke ()
#17 0x40f8eecf in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#18 0x4019ab95 in KParts::PartManager::activePartChanged ()
   from /opt/kde3/lib/libkparts.so.2
#19 0x401a2205 in KParts::PartManager::setActivePart ()
   from /opt/kde3/lib/libkparts.so.2
#20 0x08060517 in Kontact::MainWindow::selectPlugin ()
#21 0x080633de in Kontact::MainWindow::qt_invoke ()
#22 0x40f8eecf in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#23 0x0805e2ed in Kontact::SidePaneBase::pluginSelected ()
#24 0x0805e371 in Kontact::SidePaneBase::qt_emit ()
#25 0x0805e3af in Kontact::IconSidePane::qt_emit ()
#26 0x40f8eea3 in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#27 0x0805b65d in Kontact::Navigator::pluginActivated ()
#28 0x41069b1a in QListBox::mousePressEventEx ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#29 0x410698dc in QListBox::mousePressEvent ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#30 0x40fc6c8d in QWidget::event () from /usr/lib/qt3/lib/libqt-mt.so.3
#31 0x40f2bcab in QApplication::internalNotify ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#32 0x40f2b2c1 in QApplication::notify () from /usr/lib/qt3/lib/libqt-mt.so.3
#33 0x40b44aee in KApplication::notify () from /opt/kde3/lib/libkdecore.so.4
#34 0x40ec0c8e in QApplication::sendSpontaneousEvent ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#35 0x40eb9685 in QETWidget::translateMouseEvent ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#36 0x40eb74b4 in QApplication::x11ProcessEvent ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#37 0x40ed245b in QEventLoop::processEvents ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#38 0x40f40141 in QEventLoop::enterLoop () from /usr/lib/qt3/lib/libqt-mt.so.3
#39 0x40f4005a in QEventLoop::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#40 0x40f2be17 in QApplication::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#41 0x08063c07 in main ()