Application that crashed: kontact
Version of the application: 4.3.0 rc1
KDE Version: 4.2.95 (KDE 4.2.95 (KDE 4.3 RC1))
Qt Version: 4.5.0
Operating System: Linux 2.6.28-13-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
i was typing a new mail using kontact, added someone to the addressbook by right-clicking in the main kontact window on the address in the header and adding it, then wanted to go back to my mail, and i couldn't click on buttons or focus anything in my new mail window, also not in the main contact window. There is not really something specific after which the crash happened, so can't help you much further

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0xb722265d in KABC::AddressBook::loadingHasFinished (this=0xbfac3f5c) at /usr/include/qt4/QtCore/qlist.h:88
#7  0xb77d3b45 in KPIM::KAddrBookExternal::addEmail () from /usr/lib/libkdepim.so.4
#8  0xb12a2308 in KMMailtoAddAddrBookCommand::execute () from /usr/lib/libkmailprivate.so.4
#9  0xb129c082 in KMCommand::slotPostTransfer () from /usr/lib/libkmailprivate.so.4
#10 0xb12a6164 in KMCommand::qt_metacall () from /usr/lib/libkmailprivate.so.4
#11 0xb12a6ad2 in KMMailtoAddAddrBookCommand::qt_metacall () from /usr/lib/libkmailprivate.so.4
#12 0xb5bf1ca8 in QMetaObject::activate (sender=0xab9d220, from_signal_index=4, to_signal_index=4, argv=0xbfac410c) at kernel/qobject.cpp:3069
#13 0xb5bf2932 in QMetaObject::activate (sender=0xab9d220, m=0xb16d0614, local_signal_index=0, argv=0xbfac410c) at kernel/qobject.cpp:3143
#14 0xb1298023 in KMCommand::messagesTransfered () from /usr/lib/libkmailprivate.so.4
#15 0xb12b5b2c in KMCommand::transferSelectedMsgs () from /usr/lib/libkmailprivate.so.4
#16 0xb12b5d83 in KMCommand::slotStart () from /usr/lib/libkmailprivate.so.4
#17 0xb12a6173 in KMCommand::qt_metacall () from /usr/lib/libkmailprivate.so.4
#18 0xb12a6ad2 in KMMailtoAddAddrBookCommand::qt_metacall () from /usr/lib/libkmailprivate.so.4
#19 0xb5bf1ca8 in QMetaObject::activate (sender=0xaf3f3e8, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3069
#20 0xb5bf2932 in QMetaObject::activate (sender=0xaf3f3e8, m=0xb5ccd908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3143
#21 0xb5bf70a7 in QSingleShotTimer::timeout (this=0xaf3f3e8) at .moc/release-shared/qtimer.moc:76
#22 0xb5bf71cc in QSingleShotTimer::timerEvent (this=0xaf3f3e8) at kernel/qtimer.cpp:298
#23 0xb5bec15f in QObject::event (this=0xaf3f3e8, e=0xbfac475c) at kernel/qobject.cpp:1082
#24 0xb60bbe9c in QApplicationPrivate::notify_helper (this=0x93dae58, receiver=0xaf3f3e8, e=0xbfac475c) at kernel/qapplication.cpp:4084
#25 0xb60c419e in QApplication::notify (this=0xbfac4a08, receiver=0xaf3f3e8, e=0xbfac475c) at kernel/qapplication.cpp:3631
#26 0xb6ce23dd in KApplication::notify (this=0xbfac4a08, receiver=0xaf3f3e8, event=0xbfac475c) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:302
#27 0xb5bdba3b in QCoreApplication::notifyInternal (this=0xbfac4a08, receiver=0xaf3f3e8, event=0xbfac475c) at kernel/qcoreapplication.cpp:602
#28 0xb5c0ad71 in QTimerInfoList::activateTimers (this=0x93d259c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#29 0xb5c074e0 in timerSourceDispatch (source=0x93d2568) at kernel/qeventdispatcher_glib.cpp:164
#30 0xb4ca0b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb4ca40eb in ?? () from /usr/lib/libglib-2.0.so.0
#32 0xb4ca4268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0xb5c07438 in QEventDispatcherGlib::processEvents (this=0x93cf098, flags={i = -1079228200}) at kernel/qeventdispatcher_glib.cpp:323
#34 0xb615d365 in QGuiEventDispatcherGlib::processEvents (this=0x93cf098, flags={i = -1079228152}) at kernel/qguieventdispatcher_glib.cpp:202
#35 0xb5bda06a in QEventLoop::processEvents (this=0xbfac4980, flags={i = -1079228088}) at kernel/qeventloop.cpp:149
#36 0xb5bda4aa in QEventLoop::exec (this=0xbfac4980, flags={i = -1079228024}) at kernel/qeventloop.cpp:200
#37 0xb5bdc959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#38 0xb60bbd17 in QApplication::exec () at kernel/qapplication.cpp:3553
#39 0x0804bfef in _start ()

Reported using DrKonqi