Version:           Kontact 1.3 (KDE 4.1.96) (using Devel)
OS:                Linux
Installed from:    Compiled sources

Since KDE 4.1.85 kontact crashes on startup. Kmail start fine if they are run seperately, but kontact crashes. 
Kontact is able to display the summary view before it crashes, and sometimes I can start kmail from kontact but after few seconds crash.

This is what I get from konsole:

maxx@austin:~ $ kontact
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
<unknown program name>(9841)/ main: Unknown resource type:  "notes"
<unknown program name>(9831)/: Communication problem with  "kontact" , it probably crashed.
Error message was:  "org.freedesktop.DBus.Error.NoReply" : " "Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken." "

maxx@austin:~ $ *** KMail got signal 11 (Crashing)
KCrash: Application 'kontact' crashing...
sock_file=/home/maxx/.kde4/socket-austin/kdeinit4__0


--------------
This is the backtrace:

Aplicación: Kontact (kontact), señal SIGSEGV
[Current thread is 1 (Thread 0xb48da700 (LWP 9832))]

Thread 3 (Thread 0xb030eb90 (LWP 9836)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb6566f62 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb65c784c in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0xb65bc9c6 in ?? () from /usr/lib/libQtCore.so.4
#4  0xb65c685e in ?? () from /usr/lib/libQtCore.so.4
#5  0xb65631b5 in start_thread () from /lib/libpthread.so.0
#6  0xb597838e in clone () from /lib/libc.so.6

Thread 2 (Thread 0xaf9d3b90 (LWP 9840)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb59713e1 in select () from /lib/libc.so.6
#2  0xb6695dc7 in ?? () from /usr/lib/libQtCore.so.4
#3  0xb65c685e in ?? () from /usr/lib/libQtCore.so.4
#4  0xb65631b5 in start_thread () from /lib/libpthread.so.0
#5  0xb597838e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb48da700 (LWP 9832)):
[KCrash Handler]
#6  0xb0d8d9dc in KMFolderImap::slotListFolderResult(KJob*) () from /usr/lib/libkmailprivate.so.4
#7  0xb0d906ac in KMFolderImap::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkmailprivate.so.4
#8  0xb66cb580 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#9  0xb66cc302 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#10 0xb68d5c33 in KJob::result(KJob*) () from /usr/lib/libkdecore.so.5
#11 0xb68d60d9 in KJob::emitResult() () from /usr/lib/libkdecore.so.5
#12 0xb6ef5885 in KIO::SimpleJob::slotFinished() () from /usr/lib/libkio.so.5
#13 0xb6ef59ce in KIO::ListJob::slotFinished() () from /usr/lib/libkio.so.5
#14 0xb6efa803 in KIO::ListJob::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#15 0xb66cb580 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#16 0xb66cc302 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#17 0xb6fa6fb7 in KIO::SlaveInterface::finished() () from /usr/lib/libkio.so.5
#18 0xb6fa9c0f in KIO::SlaveInterface::dispatch(int, QByteArray const&) () from /usr/lib/libkio.so.5
#19 0xb6fa75c7 in KIO::SlaveInterface::dispatch() () from /usr/lib/libkio.so.5
#20 0xb6f99ee0 in KIO::Slave::gotInput() () from /usr/lib/libkio.so.5
#21 0xb6f9a253 in KIO::Slave::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#22 0xb66cb580 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#23 0xb66cc302 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#24 0xb6ec30a7 in KIO::Connection::readyRead() () from /usr/lib/libkio.so.5
#25 0xb6ec4ad3 in KIO::ConnectionPrivate::dequeue() () from /usr/lib/libkio.so.5
#26 0xb6ec5126 in KIO::Connection::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#27 0xb66c471b in QMetaCallEvent::placeMetaCall(QObject*) () from /usr/lib/libQtCore.so.4
#28 0xb66c6281 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#29 0xb5c4b8fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#30 0xb5c5375e in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#31 0xb6c538fd in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#32 0xb66b6961 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#33 0xb66b75d5 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#34 0xb66b77cd in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#35 0xb66e136f in ?? () from /usr/lib/libQtCore.so.4
#36 0xb5065a48 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#37 0xb5069103 in ?? () from /usr/lib/libglib-2.0.so.0
#38 0xb50692c1 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#39 0xb66e0fb8 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#40 0xb5ce47b5 in ?? () from /usr/lib/libQtGui.so.4
#41 0xb66b501a in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#42 0xb66b51da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#43 0xb66b7895 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#44 0xb5c4b777 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#45 0x0804bf8f in main ()