Version:           1.3 (using KDE 4.1.96)
Installed from:    Ubuntu Packages

1) Use alt-f2
2) Typed kontact
3) Select "Kontact: Personal information manager"
4) Wait for application to start
5) Select Inbox (2 pending message)
6) Screen display "wait while retrieving messages" for 2-3s then kontact crash

If I directly select a subfolder it work.

Here is the report:
Application: Kontact (kontact), signal SIGSEGV
0x00007fe6ddc7e621 in nanosleep () from /lib/libc.so.6

Thread 1 (Thread 0x7fe6e40356f0 (LWP 10577)):
[KCrash Handler]
#5  0x0000000001951a00 in ?? ()
#6  0x00007fe6cb9825df in KMFolderImap::slotListFolderResult (this=0x1247ee0, job=0x17c1700) at /build/buildd/kdepim-4.1.96/kmail/kmfolderimap.cpp:1355
#7  0x00007fe6cb986ce4 in KMFolderImap::qt_metacall (this=0x1247ee0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffec0707a0)
    at /build/buildd/kdepim-4.1.96/obj-x86_64-linux-gnu/kmail/kmfolderimap.moc:181
#8  0x00007fe6de85b134 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#9  0x00007fe6dee8d8e2 in KJob::result (this=0x1823640, _t1=0x17c1700) at /build/buildd/kde4libs-4.1.96/obj-x86_64-linux-gnu/kdecore/kjob.moc:186
#10 0x00007fe6dee8dcaf in KJob::emitResult (this=0x17c1700) at /build/buildd/kde4libs-4.1.96/kdecore/jobs/kjob.cpp:294
#11 0x00007fe6e0bf2600 in KIO::SimpleJob::slotFinished (this=0x17c1700) at /build/buildd/kde4libs-4.1.96/kio/kio/job.cpp:489
#12 0x00007fe6e0bf2735 in KIO::ListJob::slotFinished (this=0x17c1700) at /build/buildd/kde4libs-4.1.96/kio/kio/job.cpp:2416
#13 0x00007fe6e0bf4f8d in KIO::ListJob::qt_metacall (this=0x17c1700, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffec070ae0)
    at /build/buildd/kde4libs-4.1.96/obj-x86_64-linux-gnu/kio/jobclasses.moc:747
#14 0x00007fe6de85b134 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0x00007fe6e0cb1701 in KIO::SlaveInterface::dispatch (this=0x153dc20, _cmd=104, rawdata=<value optimized out>) at /build/buildd/kde4libs-4.1.96/kio/kio/slaveinterface.cpp:175
#16 0x00007fe6e0cae1f2 in KIO::SlaveInterface::dispatch (this=0x153dc20) at /build/buildd/kde4libs-4.1.96/kio/kio/slaveinterface.cpp:91
#17 0x00007fe6e0ca03e3 in KIO::Slave::gotInput (this=0x153dc20) at /build/buildd/kde4libs-4.1.96/kio/kio/slave.cpp:322
#18 0x00007fe6e0ca1418 in KIO::Slave::qt_metacall (this=0x153dc20, _c=QMetaObject::InvokeMetaMethod, _id=26548096, _a=0x7fffec070f00)
    at /build/buildd/kde4libs-4.1.96/obj-x86_64-linux-gnu/kio/slave.moc:75
#19 0x00007fe6de85b134 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#20 0x00007fe6e0bbdda0 in KIO::ConnectionPrivate::dequeue (this=0x1554210) at /build/buildd/kde4libs-4.1.96/kio/kio/connection.cpp:82
#21 0x00007fe6e0bbdeda in KIO::Connection::qt_metacall (this=0x1552a40, _c=QMetaObject::InvokeMetaMethod, _id=26548096, _a=0x17dc8c0)
    at /build/buildd/kde4libs-4.1.96/obj-x86_64-linux-gnu/kio/connection.moc:72
#22 0x00007fe6de855da5 in QObject::event () from /usr/lib/libQtCore.so.4
#23 0x00007fe6df3ddc3d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#24 0x00007fe6df3e59ba in QApplication::notify () from /usr/lib/libQtGui.so.4
#25 0x00007fe6e07143cb in KApplication::notify (this=0x7fffec071960, receiver=0x1552a40, event=0x17b12a0) at /build/buildd/kde4libs-4.1.96/kdeui/kernel/kapplication.cpp:307
#26 0x00007fe6de846d61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#27 0x00007fe6de8479fa in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#28 0x00007fe6de86f4d3 in ?? () from /usr/lib/libQtCore.so.4
#29 0x00007fe6d859fd3b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0x00007fe6d85a350d in ?? () from /usr/lib/libglib-2.0.so.0
#31 0x00007fe6d85a36cb in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0x00007fe6de86f15f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#33 0x00007fe6df46fa6f in ?? () from /usr/lib/libQtGui.so.4
#34 0x00007fe6de845682 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#35 0x00007fe6de84580d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#36 0x00007fe6de847cbd in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#37 0x0000000000404a15 in main (argc=1, argv=0x7fffec072048) at /build/buildd/kdepim-4.1.96/kontact/src/main.cpp:218