Version:           1.9.1 (using KDE 3.5.2, Kubuntu Package 4:3.5.2-0ubuntu18.1 dapper)
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.15-26-386

Every now and then the widget containing all the subject lines is not properly drawn. Sometimes it only displays the "+"-signs at the left side, sometimes it is clear although messages are there. If I then click reply (the messages is displayed in the lower widget properly) kmail crashes and gives me:

(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(no debugging symbols found)
...
(no debugging symbols found)
[KCrash handler]
#6  0xb546f75e in KMMessage::headerField () from /usr/lib/libkmailprivate.so
#7  0xb547dd91 in KMMessage::identityUoid () from /usr/lib/libkmailprivate.so
#8  0xb547dfad in KMMessage::initFromMessage ()
   from /usr/lib/libkmailprivate.so
#9  0xb5480eea in KMMessage::createReply () from /usr/lib/libkmailprivate.so
#10 0xb565ed04 in KMReplyToCommand::execute ()
   from /usr/lib/libkmailprivate.so
#11 0xb5656162 in KMCommand::slotPostTransfer ()
   from /usr/lib/libkmailprivate.so
#12 0xb565bbbf in KMCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#13 0xb565c24b in KMReplyToCommand::qt_invoke ()
   from /usr/lib/libkmailprivate.so
#14 0xb7093eb9 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#15 0xb565513c in KMCommand::messagesTransfered ()
   from /usr/lib/libkmailprivate.so
#16 0xb565b771 in KMCommand::transferSelectedMsgs ()
   from /usr/lib/libkmailprivate.so
#17 0xb565b9c9 in KMCommand::slotStart () from /usr/lib/libkmailprivate.so
#18 0xb565bbd1 in KMCommand::qt_invoke () from /usr/lib/libkmailprivate.so
#19 0xb565c24b in KMReplyToCommand::qt_invoke ()
   from /usr/lib/libkmailprivate.so
#20 0xb7093eb9 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#21 0xb742729a in QSignal::signal () from /usr/lib/libqt-mt.so.3
#22 0xb70b1630 in QSignal::activate () from /usr/lib/libqt-mt.so.3
#23 0xb70b9120 in QSingleShotTimer::event () from /usr/lib/libqt-mt.so.3
#24 0xb7029e56 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#25 0xb702a052 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#26 0xb7727d7d in KApplication::notify () from /usr/lib/libkdecore.so.4
#27 0xb6fbb157 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#28 0xb701b843 in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#29 0xb6fcef67 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#30 0xb7042947 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#31 0xb704286a in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#32 0xb7028965 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#33 0x0805ab01 in ?? ()
#34 0xbf99b0c0 in ?? ()
#35 0x00000001 in ?? ()
#36 0x00000001 in ?? ()
#37 0x00000000 in ?? ()