Version:           1.2.3 (using KDE KDE 3.5.5)
Installed from:    Ubuntu Packages
OS:                Linux

Kontact / Kmail crashes very often during re-organizing of imap-folder structure.

here is a backtrace:

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1242036560 (LWP 8362)]
[New Thread -1281340512 (LWP 8366)]
[New Thread -1272947808 (LWP 8365)]
[New Thread -1264555104 (LWP 8364)]
[New Thread -1256162400 (LWP 8363)]
[KCrash handler]
#6  0xb54ea605 in KMFolder::folderType (this=0x8899bc0)
    at /build/buildd/kdepim-3.5.5/./kmail/kmfolder.cpp:222
#7  0xb54978d7 in KMFolderTree::doFolderSelected (this=0x8ddead0, 
    qlvi=0x8f92eb0) at /build/buildd/kdepim-3.5.5/./kmail/kmfoldertree.cpp:916
#8  0xb5497a41 in KMFolderTree::contentsMouseReleaseEvent (this=0x8ddead0, 
    me=0xbff90edc) at /build/buildd/kdepim-3.5.5/./kmail/kmfoldertree.cpp:1091
#9  0xb7130fcf in QScrollView::viewportMouseReleaseEvent ()
   from /usr/lib/libqt-mt.so.3
#10 0xb7132566 in QScrollView::eventFilter () from /usr/lib/libqt-mt.so.3
#11 0xb70fa816 in QListView::eventFilter () from /usr/lib/libqt-mt.so.3
#12 0xb5495529 in KMFolderTree::eventFilter (this=0x8ddead0, o=0x8ddf408, 
    e=0xbff91480) at /build/buildd/kdepim-3.5.5/./kmail/kmfoldertree.cpp:1652
#13 0xb6ffaf04 in QObject::activate_filters () from /usr/lib/libqt-mt.so.3
#14 0xb6ffaf82 in QObject::event () from /usr/lib/libqt-mt.so.3
#15 0xb703265b in QWidget::event () from /usr/lib/libqt-mt.so.3
#16 0xb6f92b88 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#17 0xb6f94d46 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#18 0xb76bcdb2 in KApplication::notify (this=0xbff91a50, receiver=0x8ddf408, 
    event=0xbff91480)
    at /build/buildd/kdelibs-3.5.5/./kdecore/kapplication.cpp:550
#19 0xb6f253fd in QApplication::sendSpontaneousEvent ()
   from /usr/lib/libqt-mt.so.3
#20 0xb6f24062 in QETWidget::translateMouseEvent ()
   from /usr/lib/libqt-mt.so.3
#21 0xb6f2214c in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3
#22 0xb6f39320 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#23 0xb6fad25e in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#24 0xb6fad06e in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#25 0xb6f94731 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#26 0x0805ad81 in main (argc=1, argv=0x12)
    at /build/buildd/kdepim-3.5.5/./kontact/src/main.cpp:161
#27 0xb775a8cc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#28 0x08058311 in _start ()