Version:           1.9.50 (using KDE Devel)
Installed from:    Compiled sources
Compiler:          g++ (GCC) 4.2.3 20071123 (prerelease) (Debian 4.2.2-4) Current Debian (Testing/Lenny)
OS:                Linux

kmail crashes when one tries to move email messages from one imap folder to another.
For example:
I right click a message in the inbox of abgrund@silberdrache.net, go to "Move to", go to "Silberdrache.net" and click "trash" or any other folder. Same goes when I try to drag and drop a message to any folder, except the folder in which the mail already is. It does *not* crash moving mail to a local folder.

The compile has been made on a Debian Linux (Testing) system, strictly following the  guide at: http://techbase.kde.org/Getting_Started/Build/KDE4
It consists of kdesupport, kdelibs, kdepimlibs, kdebase, kdepim updated earlier today in the  given order. kdepim is compiled with "-DWITH_MySQL=off"

Here is a stack trace, hoping it is of any use since it is a  custom compile.
Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 0x2af63f798f10 (LWP 25000)]
[KCrash handler]
#5  0x00002af63967bfd5 in raise () from /lib/libc.so.6
#6  0x00002af63967da30 in abort () from /lib/libc.so.6
#7  0x00002af62e7f5075 in qt_message_output () from /usr/lib/libQtCore.so.4
#8  0x00002af62e7f5197 in qFatal () from /usr/lib/libQtCore.so.4
#9  0x00002af630132e01 in QList<int>::first (this=0x7fff7c51f290)
    at /usr/include/qt4/QtCore/qlist.h:244
#10 0x00002af6301a3a50 in KMFolderImap::addMsg (this=0x986fc0, 
    aMsg=0x11100b0, aIndex_ret=0x7fff7c51f2fc)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmfolderimap.cpp:413
#11 0x00002af63012e2be in FolderStorage::addMessages (this=0x986fc0, 
    msgList=@0x7fff7c51f3d0, index_ret=@0x7fff7c51f370)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/folderstorage.cpp:1161
#12 0x00002af63012fe61 in FolderStorage::moveMsg (this=0x986fc0, 
    msglist=@0x7fff7c51f3d0, aIndex_ret=0x7fff7c51f45c)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/folderstorage.cpp:625
#13 0x00002af630114e9c in KMFolder::moveMsg (this=0x985890, 
    q=@0x7fff7c51f500, index_return=0x7fff7c51f45c)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmfolder.cpp:438
#14 0x00002af63023e9b1 in KMMoveCommand::execute (this=0x1220c50)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmcommands.cpp:2127
#15 0x00002af6302491a4 in KMCommand::slotPostTransfer (this=0x1220c50, 
    result=KMCommand::OK)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmcommands.cpp:269
#16 0x00002af630249604 in KMCommand::qt_metacall (this=0x1220c50, 
    _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0x7fff7c51fb20)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmcommands.moc:85
#17 0x00002af630249aa9 in KMMoveCommand::qt_metacall (this=0x1220c50, 
    _c=QMetaObject::InvokeMetaMethod, _id=9, _a=0x7fff7c51fb20)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmcommands.moc:1661
#18 0x00002af62e8b3d51 in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
#19 0x00002af630237820 in KMCommand::messagesTransfered (this=0x1220c50, 
    _t1=KMCommand::OK)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmcommands.moc:99
#20 0x00002af6302490f3 in KMCommand::transferSelectedMsgs (this=0x1220c50)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmcommands.cpp:363
#21 0x00002af6302494cf in KMCommand::slotStart (this=0x1220c50)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmcommands.cpp:261
#22 0x00002af6302495ec in KMCommand::qt_metacall (this=0x1220c50, 
    _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0x7fff7c520240)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmcommands.moc:84
#23 0x00002af630249aa9 in KMMoveCommand::qt_metacall (this=0x1220c50, 
    _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0x7fff7c520240)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/kmcommands.moc:1661
#24 0x00002af62e8b3d51 in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
#25 0x00002af62e8b9d0f in ?? () from /usr/lib/libQtCore.so.4
#26 0x00002af62e8b301c in QObject::event () from /usr/lib/libQtCore.so.4
#27 0x00002af637d1b82b in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#28 0x00002af637d1f193 in QApplication::notify () from /usr/lib/libQtGui.so.4
#29 0x00002af63366bd76 in KApplication::notify (this=0x7fff7c520ce0, 
    receiver=0x1228150, event=0x7fff7c5208a0)
    at /home/kde-devel/kde/src/KDE/kdelibs/kdeui/kernel/kapplication.cpp:319
#30 0x00002af62e8a1ef0 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#31 0x00002af62e8c5c16 in ?? () from /usr/lib/libQtCore.so.4
#32 0x00002af62e8c29ed in ?? () from /usr/lib/libQtCore.so.4
#33 0x00002af639f1adf4 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#34 0x00002af639f1e0dd in ?? () from /usr/lib/libglib-2.0.so.0
#35 0x00002af639f1e5ae in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#36 0x00002af62e8c2f41 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#37 0x00002af637d910ff in ?? () from /usr/lib/libQtGui.so.4
#38 0x00002af62e8a13c8 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
#39 0x00002af62e8a14e6 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#40 0x00002af62e8a3651 in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
#41 0x0000000000402ee4 in main (argc=3, argv=0x7fff7c520e68)
    at /home/kde-devel/kde/src/KDE/kdepim/kmail/main.cpp:129
#0  0x00002af6396e7b50 in nanosleep () from /lib/libc.so.6