Version:           1.4.3 (using KDE 3.0.5)
Compiler:          gcc version 3.2.1 20021207 (Gentoo Linux 3.2.1-20021207)
OS:          Linux (i586) release 2.4.19-gentoo-r10

When closing the Settings-->Configure Filters dialog KMail bombs with a SigSegV. This happens both on the "OK" and "Cancel" buttons. If changes have been made prior to pressing "OK" then they have been applied when KMail is next loaded.
Traceback follows :

0x41461ce9 in wait4 () from /lib/libc.so.6
#0  0x41461ce9 in wait4 () from /lib/libc.so.6
#1  0x414dafd4 in __DTOR_END__ () from /lib/libc.so.6
#2  0x4134190f in waitpid () from /lib/libpthread.so.0
#3  0x40a1902c in KCrash::defaultCrashHandler(int) ()
   from /usr/kde/3/lib/libkdecore.so.4
#4  <signal handler called>
#5  0x00000001 in ?? ()
#6  0x40f5ca54 in QDialog::accept() () from /usr/qt/3/lib/libqt-mt.so.3
#7  0x408819d3 in KDialogBase::slotOk() () from /usr/kde/3/lib/libkdeui.so.4
#8  0x40883fa9 in KDialogBase::qt_invoke(int, QUObject*) ()
   from /usr/kde/3/lib/libkdeui.so.4
#9  0x0815d02a in void qHeapSortPushDown<int>(int*, int, int) ()
#10 0x40e0fceb in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/qt/3/lib/libqt-mt.so.3
#11 0x40e0fb90 in QObject::activate_signal(int) ()
   from /usr/qt/3/lib/libqt-mt.so.3
#12 0x410c2308 in QButton::clicked() () from /usr/qt/3/lib/libqt-mt.so.3
#13 0x40e89d9b in QButton::mouseReleaseEvent(QMouseEvent*) ()
   from /usr/qt/3/lib/libqt-mt.so.3
#14 0x40e3fa04 in QWidget::event(QEvent*) () from /usr/qt/3/lib/libqt-mt.so.3
#15 0x40db6ae4 in QApplication::internalNotify(QObject*, QEvent*) ()
   from /usr/qt/3/lib/libqt-mt.so.3
#16 0x40db612c in QApplication::notify(QObject*, QEvent*) ()
   from /usr/qt/3/lib/libqt-mt.so.3
#17 0x4099ba93 in KApplication::notify(QObject*, QEvent*) ()
   from /usr/kde/3/lib/libkdecore.so.4
#18 0x40d61f21 in QETWidget::translateMouseEvent(_XEvent const*) ()
   from /usr/qt/3/lib/libqt-mt.so.3
#19 0x40d5fba0 in QApplication::x11ProcessEvent(_XEvent*) ()
   from /usr/qt/3/lib/libqt-mt.so.3
#20 0x40d73cd6 in QEventLoop::processEvents(unsigned) ()
   from /usr/qt/3/lib/libqt-mt.so.3
#21 0x40dc911f in QEventLoop::enterLoop() () from /usr/qt/3/lib/libqt-mt.so.3
#22 0x40dc8fd4 in QEventLoop::exec() () from /usr/qt/3/lib/libqt-mt.so.3
#23 0x40db6d20 in QApplication::exec() () from /usr/qt/3/lib/libqt-mt.so.3
#24 0x0819766c in QListBoxItem::setText(QString const&) ()
#25 0x413cfda7 in __libc_start_main () from /lib/libc.so.6