Version:           kmail (kde4) 1.10.0  Kontact 1.3 (using KDE 4.1.0)
Installed from:    Ubuntu Packages
OS:                Linux

Kontact crashed when i was organizing the kmail folders. After moving a lot of folders (importet from 3.5-based version) kontact crashed when moving a single mail or a single folder to the top level folder  ("local folder"). Since crashing started the system crashes everytime, when the described actin is done.
After restarting kontact every folder is in the new level. It seems, that no messeages are lost. (I've done a very cursorily check).

Report follows:

Anwendung: Kontact (kontact), Signal SIGSEGV
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0x7f7e42f09780 (LWP 12171)]
[KCrash handler]
#5  0x0000000000000000 in ?? ()
#6  0x00007f7e3ec87aa7 in Q3ListView::contentsMousePressEventEx (
    this=0xe81170, e=0x7fff4af45070) at itemviews/q3listview.cpp:4163
#7  0x00007f7e3d76087c in K3ListView::contentsMousePressEvent (this=0xe81170, 
    e=0x7fff4af45070)
    at /build/buildd/kde4libs-4.1.0/kde3support/kdeui/k3listview.cpp:790
#8  0x00007f7e3ecd29e9 in Q3ScrollView::viewportMousePressEvent (
    this=0xe81170, e=0x7fff4af457a0) at widgets/q3scrollview.cpp:1744
#9  0x00007f7e3ecd4562 in Q3ScrollView::eventFilter (this=0xe81170, 
    obj=0xd97860, e=0x7fff4af457a0) at widgets/q3scrollview.cpp:1472
#10 0x00007f7e3ec8054e in Q3ListView::eventFilter (this=0xe81170, o=0xd97860, 
    e=0x7fff4af457a0) at itemviews/q3listview.cpp:3777
#11 0x00007f7e2c41f887 in ?? () from /usr/lib/kde4/lib/libkmailprivate.so.4
#12 0x00007f7e418a740e in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0xd97860, event=0x7fff4af457a0)
    at kernel/qcoreapplication.cpp:694
#13 0x00007f7e40dc5520 in QApplicationPrivate::notify_helper (this=0x62bd60, 
    receiver=0xd97860, e=0x7fff4af457a0) at kernel/qapplication.cpp:3768
#14 0x00007f7e40dca329 in QApplication::notify (this=0x7fff4af46460, 
    receiver=0xd97860, e=0x7fff4af457a0) at kernel/qapplication.cpp:3501
#15 0x00007f7e421bdbd1 in KApplication::notify (this=0x7fff4af46460, 
    receiver=0xd97860, event=0x7fff4af457a0)
    at /build/buildd/kde4libs-4.1.0/kdeui/kernel/kapplication.cpp:311
#16 0x00007f7e418a7109 in QCoreApplication::notifyInternal (
    this=0x7fff4af46460, receiver=0xd97860, event=0x7fff4af457a0)
    at kernel/qcoreapplication.cpp:587
#17 0x00007f7e40dc7455 in QApplicationPrivate::sendMouseEvent (
    receiver=0xd97860, event=0x7fff4af457a0, 
    alienWidget=<value optimized out>, nativeWidget=0x77f030, 
    buttonDown=<value optimized out>, lastMouseReceiver=@0x7f7e41758280)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#18 0x00007f7e40e29756 in QETWidget::translateMouseEvent (this=0x77f030, 
    event=<value optimized out>) at kernel/qapplication_x11.cpp:4133
#19 0x00007f7e40e2866b in QApplication::x11ProcessEvent (this=0x13b, 
    event=0x7fff4af460b0) at kernel/qapplication_x11.cpp:3255
#20 0x00007f7e40e4e8f3 in x11EventSourceDispatch (s=0x62f410, callback=0, 
    user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:148
#21 0x00007f7e3b0773d4 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#22 0x00007f7e3b07a6e5 in ?? () from /usr/lib/libglib-2.0.so.0
#23 0x00007f7e3b07abcb in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#24 0x00007f7e418d03af in QEventDispatcherGlib::processEvents (this=0x61fcc0, 
    flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:325
#25 0x00007f7e40e4e72f in QGuiEventDispatcherGlib::processEvents (
    this=0x1f78d30, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:204
#26 0x00007f7e418a6585 in QEventLoop::processEvents (
    this=<value optimized out>, flags=@0x7fff4af46390)
    at kernel/qeventloop.cpp:149
#27 0x00007f7e418a66db in QEventLoop::exec (this=0x7fff4af463d0, 
    flags=@0x7fff4af463e0) at kernel/qeventloop.cpp:200
#28 0x00007f7e418a8729 in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:845
#29 0x0000000000403c25 in _start ()
#0  0x00007f7e4062db50 in __nanosleep_nocancel () from /lib/libc.so.6