Version:           1.10.90 (using 4.1.69 (KDE 4.1.69 (KDE 4.2 >= 20081009)), Gentoo)
Compiler:          i686-pc-linux-gnu-gcc
OS:                Linux (i686) release 2.6.26-gentoo-r1

What I did:

- I fired up kontact and created an IMAP Mail account (only account)
- The first time I was asked to enter the password (automatic mail check for the newly created account) 
- I hit cancel (in fact I had to hit it like 10 times before it gave up...)
- I changed the settings of that IMAP Account (auto expunge from on to off)
- When I wanted to open the account I was again asked for the password.
- I entered the password and kontact crashed with the backtrace below:

Remark: Subsequent "logins" do not crash any longer

Application: Kontact (kontact), signal SIGSEGV

Thread 1 (Thread 0xb4ee4720 (LWP 12034)):
[KCrash Handler]
#6  0xb1bd981e in QPointer<KMAccount>::operator KMAccount* (this=0x7280039) at /usr/include/qt4/QtCore/qpointer.h:79
#7  0xb1bd0053 in AccountsPageReceivingTab::save (this=0x86e80c0) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail-4.1.69/kmail/configuredialog.cpp:1192
#8  0xb1be77b7 in ConfigModuleWithTabs::save (this=0x86eb628) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail-4.1.69/kmail/configuredialog_p.cpp:323
#9  0xb598480b in KCModuleProxy::save (this=0x86ecbd0) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kutils/kcmoduleproxy.cpp:276
#10 0xb5980709 in KCMultiDialogPrivate::apply (this=0x86d81b8) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kutils/kcmultidialog.cpp:192
#11 0xb598224a in KCMultiDialog::qt_metacall (this=0x86d2f78, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbf87dfe8)
    at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kutils/kcmultidialog.moc:86
#12 0xb1bd8060 in ConfigureDialog::qt_metacall (this=0x86d2f78, _c=QMetaObject::InvokeMetaMethod, _id=77, _a=0xbf87dfe8)
    at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail_build/kmail/configuredialog.moc:67
#13 0xb7f924e1 in QMetaObject::activate (sender=0x86d2f78, from_signal_index=<value optimized out>, to_signal_index=42, argv=0x0) at kernel/qobject.cpp:3028
#14 0xb7f943d8 in QMetaObject::activate (sender=0x86d2f78, m=0xb7c1f684, local_signal_index=7, argv=0x0) at kernel/qobject.cpp:3098
#15 0xb7a4667d in KDialog::applyClicked (this=0x86d2f78) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kdeui/kdialog.moc:235
#16 0xb7a47a5d in KDialog::slotButtonClicked (this=0x86d2f78, button=8) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kdeui/dialogs/kdialog.cpp:848
#17 0xb7a49a4c in KDialog::qt_metacall (this=0x86d2f78, _c=QMetaObject::InvokeMetaMethod, _id=33, _a=0xbf87e21c) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kdeui/kdialog.moc:181
#18 0xb7af8220 in KPageDialog::qt_metacall (this=0x86d2f78, _c=QMetaObject::InvokeMetaMethod, _id=68, _a=0xbf87e21c)
    at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kdeui/kpagedialog.moc:63
#19 0xb59821d8 in KCMultiDialog::qt_metacall (this=0x86d2f78, _c=QMetaObject::InvokeMetaMethod, _id=68, _a=0xbf87e21c)
    at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kutils/kcmultidialog.moc:77
#20 0xb1bd8060 in ConfigureDialog::qt_metacall (this=0x86d2f78, _c=QMetaObject::InvokeMetaMethod, _id=68, _a=0xbf87e21c)
    at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail_build/kmail/configuredialog.moc:67
#21 0xb7f924e1 in QMetaObject::activate (sender=0x86d8208, from_signal_index=<value optimized out>, to_signal_index=4, argv=0xbf87e21c) at kernel/qobject.cpp:3028
#22 0xb7f943d8 in QMetaObject::activate (sender=0x86d8208, m=0xb805f970, local_signal_index=0, argv=0xbf87e21c) at kernel/qobject.cpp:3098
#23 0xb7f95c27 in QSignalMapper::mapped (this=0x86d8208, _t1=8) at .moc/debug-shared/moc_qsignalmapper.cpp:93
#24 0xb7f96431 in QSignalMapper::map (this=0x86d8208, sender=0x86defd8) at kernel/qsignalmapper.cpp:277
#25 0xb7f9662e in QSignalMapper::map (this=0x86d8208) at kernel/qsignalmapper.cpp:268
#26 0xb7f96f7d in QSignalMapper::qt_metacall (this=0x86d8208, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbf87e3ac) at .moc/debug-shared/moc_qsignalmapper.cpp:80
#27 0xb7f924e1 in QMetaObject::activate (sender=0x86defd8, from_signal_index=<value optimized out>, to_signal_index=30, argv=0xbf87e3ac) at kernel/qobject.cpp:3028
#28 0xb7f92904 in QMetaObject::activate (sender=0x86defd8, m=0xb62a1384, from_local_signal_index=2, to_local_signal_index=3, argv=0xbf87e3ac) at kernel/qobject.cpp:3118
#29 0xb60d09d3 in QAbstractButton::clicked (this=0x86defd8, _t1=false) at .moc/debug-shared/moc_qabstractbutton.cpp:185
#30 0xb5e2833f in QAbstractButtonPrivate::emitClicked (this=0x86df380) at widgets/qabstractbutton.cpp:544
#31 0xb5e29dda in QAbstractButtonPrivate::click (this=0x86df380) at widgets/qabstractbutton.cpp:537
#32 0xb5e2a003 in QAbstractButton::mouseReleaseEvent (this=0x86defd8, e=0xbf87ea9c) at widgets/qabstractbutton.cpp:1116
#33 0xb5b3a5a2 in QWidget::event (this=0x86defd8, event=0xbf87ea9c) at kernel/qwidget.cpp:7169
#34 0xb5e2820c in QAbstractButton::event (this=0x86defd8, e=0xbf87ea9c) at widgets/qabstractbutton.cpp:1078
#35 0xb5ecd13a in QPushButton::event (this=0x86defd8, e=0xbf87ea9c) at widgets/qpushbutton.cpp:658
#36 0xb5ae1fab in QApplicationPrivate::notify_helper (this=0x8066e00, receiver=0x86defd8, e=0xbf87ea9c) at kernel/qapplication.cpp:3809
#37 0xb5ae9438 in QApplication::notify (this=0xbf87f128, receiver=0x86defd8, e=0xbf87ea9c) at kernel/qapplication.cpp:3534
#38 0xb7ace2b1 in KApplication::notify (this=0xbf87f128, receiver=0x86defd8, event=0xbf87ea9c) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kdeui/kernel/kapplication.cpp:307
#39 0xb7f7bb21 in QCoreApplication::notifyInternal (this=0xbf87f128, receiver=0x86defd8, event=0xbf87ea9c) at kernel/qcoreapplication.cpp:593
#40 0xb5aea879 in QApplicationPrivate::sendMouseEvent (receiver=0x86defd8, event=0xbf87ea9c, alienWidget=0x86defd8, nativeWidget=0x86d2f78, buttonDown=0xb62a7c60, lastMouseReceiver=@0xb62a7c64)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#41 0xb5b529e7 in QETWidget::translateMouseEvent (this=0x86d2f78, event=0xbf87efa8) at kernel/qapplication_x11.cpp:4048
#42 0xb5b5131e in QApplication::x11ProcessEvent (this=0xbf87f128, event=0xbf87efa8) at kernel/qapplication_x11.cpp:3044
#43 0xb5b7796d in QEventDispatcherX11::processEvents (this=0x8061ff0, flags={i = -1081610168}) at kernel/qeventdispatcher_x11.cpp:134
#44 0xb7f7a6b0 in QEventLoop::processEvents (this=0xbf87f0c0, flags={i = -1081610104}) at kernel/qeventloop.cpp:149
#45 0xb7f7a852 in QEventLoop::exec (this=0xbf87f0c0, flags={i = -1081610040}) at kernel/qeventloop.cpp:200
#46 0xb7f7cc6f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:851
#47 0xb5ae1d43 in QApplication::exec () at kernel/qapplication.cpp:3337
#48 0x0804b901 in main (argc=1, argv=0xbf87f2e4) at /var/tmp/portage/kde-base/kontact-4.1.69/work/kontact-4.1.69/kontact/src/main.cpp:218