Version:            (using KDE KDE 3.1)
Installed from:    Compiled From Sources
Compiler:          GCC 3.2.1 
OS:          Linux

This crash occurs whenever I modify the main toolbar (I was removing items) and click the apply button. The settings get saved, but Konqueror crashes.
Here's a backtrace:

(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...[New Thread 1024 (LWP 11949)]
0x40f8d599 in wait4 () from /lib/libc.so.6
#0  0x40f8d599 in wait4 () from /lib/libc.so.6
#1  0x41011bdc in __DTOR_END__ () from /lib/libc.so.6
#2  0x40e0a0b3 in waitpid () from /lib/libpthread.so.0
#3  0x40575efc in KCrash::defaultCrashHandler(int) ()
   from /usr/kde-3.1/lib/libkdecore.so.4
#4  0x40e07e1b in pthread_sighandler () from /lib/libpthread.so.0
#5  <signal handler called>
#6  0x40b3d649 in QString::QString(QString const&) ()
   from /usr/qt/lib/libqt-mt.so.3
#7  0x4174edc1 in KonqMainWindow::plugViewModeActions() ()
   from /usr/kde-3.1/lib/konqueror.so
#8  0x41741fb1 in KonqMainWindow::slotNewToolbarConfig() ()
   from /usr/kde-3.1/lib/konqueror.so
#9  0x41751294 in KonqMainWindow::qt_invoke(int, QUObject*) ()
   from /usr/kde-3.1/lib/konqueror.so
#10 0x408c37f9 in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/qt/lib/libqt-mt.so.3
#11 0x408c369d in QObject::activate_signal(int) ()
   from /usr/qt/lib/libqt-mt.so.3
#12 0x40428167 in KEditToolbar::newToolbarConfig() ()
   from /usr/kde-3.1/lib/libkdeui.so.4
#13 0x40421f7a in KEditToolbar::slotApply() ()
   from /usr/kde-3.1/lib/libkdeui.so.4
#14 0x403eae49 in KDialogBase::qt_invoke(int, QUObject*) ()
   from /usr/kde-3.1/lib/libkdeui.so.4
#15 0x404281a9 in KEditToolbar::qt_invoke(int, QUObject*) ()
   from /usr/kde-3.1/lib/libkdeui.so.4
#16 0x408c3770 in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/qt/lib/libqt-mt.so.3
#17 0x408c369d in QObject::activate_signal(int) ()
   from /usr/qt/lib/libqt-mt.so.3
#18 0x40ba971e in QButton::clicked() () from /usr/qt/lib/libqt-mt.so.3
#19 0x409456a6 in QButton::mouseReleaseEvent(QMouseEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#20 0x408f7a4c in QWidget::event(QEvent*) () from /usr/qt/lib/libqt-mt.so.3
#21 0x40865c56 in QApplication::internalNotify(QObject*, QEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#22 0x408654bf in QApplication::notify(QObject*, QEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#23 0x40514e35 in KApplication::notify(QObject*, QEvent*) ()
   from /usr/kde-3.1/lib/libkdecore.so.4
#24 0x4080cadb in QETWidget::translateMouseEvent(_XEvent const*) ()
   from /usr/qt/lib/libqt-mt.so.3
#25 0x4080a57d in QApplication::x11ProcessEvent(_XEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#26 0x4081f58a in QEventLoop::processEvents(unsigned) ()
   from /usr/qt/lib/libqt-mt.so.3
#27 0x40879896 in QEventLoop::enterLoop() () from /usr/qt/lib/libqt-mt.so.3
#28 0x40865f01 in QApplication::enter_loop() () from /usr/qt/lib/libqt-mt.so.3
#29 0x40a280f1 in QDialog::exec() () from /usr/qt/lib/libqt-mt.so.3
#30 0x41741ed6 in KonqMainWindow::slotConfigureToolbars() ()
   from /usr/kde-3.1/lib/konqueror.so
#31 0x41751289 in KonqMainWindow::qt_invoke(int, QUObject*) ()
   from /usr/kde-3.1/lib/konqueror.so
#32 0x408c37f9 in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/qt/lib/libqt-mt.so.3
#33 0x408c369d in QObject::activate_signal(int) ()
   from /usr/qt/lib/libqt-mt.so.3
#34 0x40382b61 in KAction::activated() () from /usr/kde-3.1/lib/libkdeui.so.4
#35 0x40377aab in KAction::slotActivated() ()
   from /usr/kde-3.1/lib/libkdeui.so.4
#36 0x40382caa in KAction::qt_invoke(int, QUObject*) ()
   from /usr/kde-3.1/lib/libkdeui.so.4
#37 0x408c37f9 in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/qt/lib/libqt-mt.so.3
#38 0x40ba2b42 in QSignal::signal(QVariant const&) ()
   from /usr/qt/lib/libqt-mt.so.3
#39 0x408dda38 in QSignal::activate() () from /usr/qt/lib/libqt-mt.so.3
#40 0x409b08ed in QPopupMenu::mouseReleaseEvent(QMouseEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#41 0x408f7a4c in QWidget::event(QEvent*) () from /usr/qt/lib/libqt-mt.so.3
#42 0x40865c56 in QApplication::internalNotify(QObject*, QEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#43 0x408654bf in QApplication::notify(QObject*, QEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#44 0x40514e35 in KApplication::notify(QObject*, QEvent*) ()
   from /usr/kde-3.1/lib/libkdecore.so.4
#45 0x4080c606 in QETWidget::translateMouseEvent(_XEvent const*) ()
   from /usr/qt/lib/libqt-mt.so.3
#46 0x4080a57d in QApplication::x11ProcessEvent(_XEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#47 0x4081f58a in QEventLoop::processEvents(unsigned) ()
   from /usr/qt/lib/libqt-mt.so.3
#48 0x40879896 in QEventLoop::enterLoop() () from /usr/qt/lib/libqt-mt.so.3
#49 0x40865f01 in QApplication::enter_loop() () from /usr/qt/lib/libqt-mt.so.3
#50 0x409b34c6 in QPopupMenu::exec(QPoint const&, int) ()
   from /usr/qt/lib/libqt-mt.so.3
#51 0x4039303d in KToolBar::mousePressEvent(QMouseEvent*) ()
   from /usr/kde-3.1/lib/libkdeui.so.4
#52 0x408f7a3b in QWidget::event(QEvent*) () from /usr/qt/lib/libqt-mt.so.3
#53 0x4095f0d2 in QDockWindow::event(QEvent*) () from /usr/qt/lib/libqt-mt.so.3
#54 0x409d884c in QToolBar::event(QEvent*) () from /usr/qt/lib/libqt-mt.so.3
#55 0x403949e6 in KToolBar::event(QEvent*) ()
   from /usr/kde-3.1/lib/libkdeui.so.4
#56 0x40865c56 in QApplication::internalNotify(QObject*, QEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#57 0x408654bf in QApplication::notify(QObject*, QEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#58 0x40514e35 in KApplication::notify(QObject*, QEvent*) ()
   from /usr/kde-3.1/lib/libkdecore.so.4
#59 0x4080cadb in QETWidget::translateMouseEvent(_XEvent const*) ()
   from /usr/qt/lib/libqt-mt.so.3
#60 0x4080a57d in QApplication::x11ProcessEvent(_XEvent*) ()
   from /usr/qt/lib/libqt-mt.so.3
#61 0x4081f58a in QEventLoop::processEvents(unsigned) ()
   from /usr/qt/lib/libqt-mt.so.3
#62 0x40879896 in QEventLoop::enterLoop() () from /usr/qt/lib/libqt-mt.so.3
#63 0x40879738 in QEventLoop::exec() () from /usr/qt/lib/libqt-mt.so.3
#64 0x40865ea1 in QApplication::exec() () from /usr/qt/lib/libqt-mt.so.3
#65 0x4173661f in main () from /usr/kde-3.1/lib/konqueror.so
#66 0x0804cf89 in launch(int, char const*, char const*, char const*, int, char const*, bool, char const*, bool, char const*) ()
#67 0x0804d99a in handle_launcher_request(int) ()
#68 0x0804ddd3 in handle_requests(int) ()
#69 0x0804e803 in main ()
#70 0x40f04142 in __libc_start_main () from /lib/libc.so.6