Version:           3.1.0 (using KDE 3.1.0 (RC6))
Installed from:    compiled sources
Compiler:          gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
OS:          Linux (i686) release 2.4.18-14

My kde version: kde3.1rc6, qt3.1.1, gcc3.2,  redhat8.0, XFree86:4.2.0 on PIII. kde and qt3.1.1 compiled from source.

Bug in konqueror: A similar thing was reported earlier by someone else and it is supposed to have been fixed, but I'm experiencing it again. The situation is the following:

1) Open kde-look.org with tabbed browsing enabled.
2) Preview one of the posts, which opens a new tab that can be clicked to close.
3) Close the tab and return to the main window.
4) Now you see the "back" button is inactive (grey). 
5) Try to go back with a rightclick for popup menu
6) Crash.

It won't happen all the time... only once in a while.

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Loaded plugins:
Futuresplash and shockwave (libflashplayer.so)
acrobat pdf (nppdf.so)
real player (nprealplayer.so,rpnp.so)

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Java: Sun Java, j2re1.4.0
javascript enabled globally

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backtrace:
[New Thread 8192 (LWP 9469)]
0x41127789 in wait4 () from /lib/libc.so.6
#0  0x41127789 in wait4 () from /lib/libc.so.6
#1  0x4119d6b8 in __DTOR_END__ () from /lib/libc.so.6
#2  0x40f72e9c in waitpid () from /lib/libpthread.so.0
#3  0x4074e881 in KCrash::defaultCrashHandler(int) ()
   from /usr/local/kde/lib/libkdecore.so.4
#4  <signal handler called>
#5  0x4007155c in KonqMainWindow::slotPopupMenu(KXMLGUIClient*, QPoint const&, QPtrList<KFileItem> const&, bool) () from /usr/local/kde/lib/konqueror.so
#6  0x400712bd in KonqMainWindow::slotPopupMenu(KXMLGUIClient*, QPoint const&, KURL const&, QString const&, unsigned) () from /usr/local/kde/lib/konqueror.so
#7  0x4007789f in KonqMainWindow::qt_invoke(int, QUObject*) ()
   from /usr/local/kde/lib/konqueror.so
#8  0x40a8a6d2 in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#9  0x4016e3ab in KParts::BrowserExtension::popupMenu(KXMLGUIClient*, QPoint const&, KURL const&, QString const&, unsigned) ()
   from /usr/local/kde/lib/libkparts.so.2
#10 0x417e06d4 in KHTMLPart::popupMenu(QString const&) ()
   from /usr/local/kde/lib/libkhtml.so.4
#11 0x417e4141 in KHTMLPart::khtmlMousePressEvent(khtml::MousePressEvent*) ()
   from /usr/local/kde/lib/libkhtml.so.4
#12 0x417e3e81 in KHTMLPart::customEvent(QCustomEvent*) ()
   from /usr/local/kde/lib/libkhtml.so.4
#13 0x40a8881e in QObject::event(QEvent*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#14 0x40a387ee in QApplication::internalNotify(QObject*, QEvent*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#15 0x40a3842f in QApplication::notify(QObject*, QEvent*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#16 0x406cf3e8 in KApplication::notify(QObject*, QEvent*) ()
   from /usr/local/kde/lib/libkdecore.so.4
#17 0x417c21f5 in KHTMLView::viewportMousePressEvent(QMouseEvent*) ()
   from /usr/local/kde/lib/libkhtml.so.4
#18 0x40b6b889 in QScrollView::eventFilter(QObject*, QEvent*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#19 0x40a88918 in QObject::activate_filters(QEvent*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#20 0x40a88866 in QObject::event(QEvent*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#21 0x40ab7bba in QWidget::event(QEvent*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#22 0x40a387ee in QApplication::internalNotify(QObject*, QEvent*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#23 0x40a380a6 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#24 0x406cf3e8 in KApplication::notify(QObject*, QEvent*) ()
   from /usr/local/kde/lib/libkdecore.so.4
#25 0x409e8dc7 in QETWidget::translateMouseEvent(_XEvent const*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#26 0x409e6bfd in QApplication::x11ProcessEvent(_XEvent*) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#27 0x409f979d in QEventLoop::processEvents(unsigned) ()
   from /usr/local/qt/lib/libqt-mt.so.3
#28 0x40a49da7 in QEventLoop::enterLoop() ()
   from /usr/local/qt/lib/libqt-mt.so.3
#29 0x40a49c64 in QEventLoop::exec() () from /usr/local/qt/lib/libqt-mt.so.3
#30 0x40a389e8 in QApplication::exec() () from /usr/local/qt/lib/libqt-mt.so.3
#31 0x400526af in main () from /usr/local/kde/lib/konqueror.so
#32 0x410994ce in __libc_start_main () from /lib/libc.so.6