Version:           3.4.92 (using KDE 3.4.92 (beta2, >= 20051010), Gentoo)
Compiler:          gcc version 3.3.5-20050130 (Gentoo Linux 3.3.5.20050130-r1, ssp-3.3.5.20050130-1, pie-8.7.7.1)
OS:                Linux (i686) release 2.6.14-gentoo

To reproduce:
1. start konqueror with no document or folder loaded, just an empty window.
2. activate the option DOM-tree viewer from the tools menu (this plugin should be activated of course)
3. Konqueror crashes predictably on my system

This is the backtrace:

GNU gdb 6.0
Copyright 2003 Free Software Foundation, Inc.
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Type "show copying" to see the conditions.
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This GDB was configured as "i686-pc-linux-gnu"...Using host libthread_db library "/lib/tls/libthread_db.so.1".

(gdb) run
Starting program: /usr/kde/3.5/bin/konqueror
[Thread debugging using libthread_db enabled]
[New Thread -1236137760 (LWP 22391)]
Qt: gdb: -nograb added to command-line options.
         Use the -dograb option to enforce grabbing.
QObject::connect: No such signal DOMTreeWindow::windowClosed()
QObject::connect:  (sender name:   'DOMTreeWindow')
QObject::connect:  (receiver name: 'DOMTreeWindow')

Program received signal SIGABRT, Aborted.
[Switching to Thread -1236137760 (LWP 22391)]
0xffffe410 in ?? ()
(gdb) bt
#0  0xffffe410 in ?? ()
#1  0xbf9ab78c in ?? ()
#2  0x00000006 in ?? ()
#3  0x00005777 in ?? ()
#4  0xb654b4b1 in raise () from /lib/tls/libc.so.6
#5  0xb654cc97 in abort () from /lib/tls/libc.so.6
#6  0xb66fae57 in __cxxabiv1::__terminate(void (*)()) ()
   from //usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.5-20050130/libstdc++.so.5
#7  0xb66fae94 in std::terminate() ()
   from //usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.5-20050130/libstdc++.so.5
#8  0xb66fb006 in __cxa_throw ()
   from //usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.5-20050130/libstdc++.so.5
#9  0xb618b8e4 in DOM::DOMImplementation::createCSSStyleSheet(DOM::DOMString const&, DOM::DOMString const&) (this=0xbf9ab9b0, title=@0x0, media=@0x0)
    at dom_doc.cpp:138
#10 0xb5c1ad65 in DOMTreeView::connectToPart() (this=0x848c668)
    at domtreeview.cpp:815
#11 0xb5c1b3f2 in DOMTreeView::slotSetHtmlPartDelayed() (this=0x848c668)
    at domtreeview.cpp:853
#12 0xb5c1d88a in DOMTreeView::qt_invoke(int, QUObject*) (this=0x848c668,
    _id=71, _o=0xbf9abb40) at domtreeview.moc:260
#13 0xb6d0f6ac in QObject::activate_signal(QConnectionList*, QUObject*) (
    this=0x8390f28, clist=0x84f1700, o=0xbf9abb40) at kernel/qobject.cpp:2355
#14 0xb70f2b47 in QSignal::signal(QVariant const&) (this=0x8390f28,
    t0=@0x8390f50) at .moc/debug-shared-mt/moc_qsignal.cpp:100
#15 0xb6d3156b in QSignal::activate() (this=0x8390f28)
---Type <return> to continue, or q <return> to quit---
    at kernel/qsignal.cpp:212
#16 0xb6d3b478 in QSingleShotTimer::event(QEvent*) (this=0x8390f00)
    at kernel/qtimer.cpp:286
#17 0xb6c9f235 in QApplication::internalNotify(QObject*, QEvent*) (
    this=0xbf9ac410, receiver=0x8390f00, e=0xbf9abe90)
    at kernel/qapplication.cpp:2635
#18 0xb6c9e478 in QApplication::notify(QObject*, QEvent*) (this=0xbf9ac410,
    receiver=0x8390f00, e=0xbf9abe90) at kernel/qapplication.cpp:2358
#19 0xb750d55c in KApplication::notify(QObject*, QEvent*) (this=0xbf9ac410,
    receiver=0x8390f00, event=0xbf9abe90) at kapplication.cpp:550
#20 0xb7f6abb5 in QApplication::sendEvent(QObject*, QEvent*) (receiver=0x0,
    event=0x5777) at qapplication.h:491
#21 0xb6c8a75f in QEventLoop::activateTimers() (this=0x8136930)
    at kernel/qeventloop_unix.cpp:556
#22 0xb6c3ad5d in QEventLoop::processEvents(unsigned) (this=0x8136930, flags=4)
    at kernel/qeventloop_x11.cpp:389
#23 0xb6cb67d9 in QEventLoop::enterLoop() (this=0x8136930)
    at kernel/qeventloop.cpp:198
#24 0xb6cb66f2 in QEventLoop::exec() (this=0x8136930)
    at kernel/qeventloop.cpp:145
#25 0xb6c9f3d7 in QApplication::exec() (this=0xbf9ac410)
    at kernel/qapplication.cpp:2758
#26 0xb7efe3b2 in kdemain (argc=0, argv=0x0) at konq_main.cc:206
#27 0x0804872b in main (argc=0, argv=0x0) at konqueror.la.cc:2
(gdb)