Application that crashed: kontact
Version of the application: 4.3.0 pre
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2)) "release 139"
Qt Version: 4.5.1
Operating System: Linux 2.6.27.23-0.1-default x86_64
Distribution: "openSUSE 11.1 (x86_64)"

What I was doing when the application crashed:
I'm using KDE KDE 4.2.90 - 4.3 Beta2 and Kontact 4.3.0 pre. Sometime The Kontact crached after start ... I don't know why. The next time it is ok. 
The stability of this program is better then was in 4.0 and 4.1 but it isn't fulltime stable yet.
maybe this report help you to fix it.
Martin.  

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  Kontact::MainWindow::activatePluginModule (this=0x63b750) at /usr/src/debug/kdepim-4.2.90/kontact/src/mainwindow.cpp:300
#6  0x00000000004036f2 in KontactApp::newInstance (this=0x7ffff75656c0) at /usr/src/debug/kdepim-4.2.90/kontact/src/main.cpp:147
#7  0x00007fd2eba38df6 in KUniqueApplicationAdaptor::newInstance (this=0x7a1e60, asn_id=<value optimized out>, args=@0xa3f110) at /usr/src/debug/kdelibs-4.2.90/kdeui/kernel/kuniqueapplication.cpp:454
#8  0x00007fd2eba38e82 in KUniqueApplicationAdaptor::qt_metacall (this=0x7a1e60, _c=QMetaObject::InvokeMetaMethod, _id=-145341457, _a=0x7ffff7564960)
    at /usr/src/debug/kdelibs-4.2.90/build/kdeui/kuniqueapplication_p.moc:75
#9  0x00007fd2eaf11394 in QDBusConnectionPrivate::deliverCall (this=0x62b390, object=0x7a1e60, msg=@0x16df7b0, metaTypes=@0x7bdbe0, slotIdx=4) at qdbusintegrator.cpp:891
#10 0x00007fd2eaf12408 in QDBusConnectionPrivate::activateCall (this=0x62b390, object=0x7a1e60, flags=337, msg=@0x16df7b0) at qdbusintegrator.cpp:803
#11 0x00007fd2eaf12a31 in QDBusConnectionPrivate::activateObject (this=0x62b390, node=@0x16df788, msg=@0x16df7b0, pathStartPos=<value optimized out>) at qdbusintegrator.cpp:1352
#12 0x00007fd2eaf12d48 in QDBusActivateObjectEvent::placeMetaCall (this=0x16df740) at qdbusintegrator.cpp:1469
#13 0x00007fd2eac072b8 in QObject::event (this=0x7ffff75656c0, e=0x16df740) at kernel/qobject.cpp:1118
#14 0x00007fd2e98eff2a in QApplication::event (this=0x7ffff75656c0, e=0x16df740) at kernel/qapplication.cpp:2318
#15 0x00007fd2e98ea78d in QApplicationPrivate::notify_helper (this=0x646eb0, receiver=0x7ffff75656c0, e=0x16df740) at kernel/qapplication.cpp:4057
#16 0x00007fd2e98f2a2a in QApplication::notify (this=0x7ffff75656c0, receiver=0x7ffff75656c0, e=0x16df740) at kernel/qapplication.cpp:4022
#17 0x00007fd2eba3204b in KApplication::notify (this=0x7ffff75656c0, receiver=0x7ffff75656c0, event=0x16df740) at /usr/src/debug/kdelibs-4.2.90/kdeui/kernel/kapplication.cpp:302
#18 0x00007fd2eabf715c in QCoreApplication::notifyInternal (this=0x7ffff75656c0, receiver=0x7ffff75656c0, event=0x16df740) at kernel/qcoreapplication.cpp:610
#19 0x00007fd2eabf7dda in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x60e770) at kernel/qcoreapplication.h:213
#20 0x00007fd2eac20c13 in postEventSourceDispatch (s=<value optimized out>) at kernel/qcoreapplication.h:218
#21 0x00007fd2e44a20fb in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#22 0x00007fd2e44a58cd in ?? () from /usr/lib64/libglib-2.0.so.0
#23 0x00007fd2e44a5a8b in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#24 0x00007fd2eac2089f in QEventDispatcherGlib::processEvents (this=0x60df60, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:324
#25 0x00007fd2e9981b0f in QGuiEventDispatcherGlib::processEvents (this=0x63b750, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#26 0x00007fd2eabf59f2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -145336864}) at kernel/qeventloop.cpp:149
#27 0x00007fd2eabf5dbd in QEventLoop::exec (this=0x7ffff7565620, flags={i = -145336784}) at kernel/qeventloop.cpp:200
#28 0x00007fd2eabf80a4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#29 0x0000000000404995 in main (argc=1, argv=0x7ffff7565da8) at /usr/src/debug/kdepim-4.2.90/kontact/src/main.cpp:218

Reported using DrKonqi