Version:            (using KDE KDE 3.5.2)
Installed from:    Debian testing/unstable Packages
OS:                Linux

I start krdc and I connect to another computer's VNC, fullscreen. First, if I type Alt-tab, KWin doesn't interpret it, but it is transmitted by VNC, and the remote X eventually switches windows. After I want to do something on my machine, so I'm forced to reduce krdc with the "reduce" button on the toolbar (since the keyboard shortcuts are not interpreted by KWin). Then, if I type Alt-tab to come back on the krdc's window, KWin crashes.
Else, if I come back to krdc's window by clicking on the taskbar, there are no problems, and KWin correctly handles shortcuts with krdc's windows shown fullscreen.
But if I type Alt-tab while krdc is reduced to show it back, KWin crashes again.
I noticed it only crashes if krdc is the only window on the current desktop.

 KCrash reports this :

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Using host libthread_db library "/lib/tls/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1497581088 (LWP 5298)]
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[KCrash handler]
#5  0xa7eeee85 in KWinInternal::Workspace::nextFocusChainClient ()
   from /usr/lib/libkdeinit_kwin.so
#6  0xa7efb0db in KWinInternal::TabBox::createClientList ()
   from /usr/lib/libkdeinit_kwin.so
#7  0xa7f017b8 in KWinInternal::TabBox::reset ()
   from /usr/lib/libkdeinit_kwin.so
#8  0xa7f02020 in KWinInternal::Workspace::startKDEWalkThroughWindows ()
   from /usr/lib/libkdeinit_kwin.so
#9  0xa7f22e67 in KWinInternal::Workspace::slotWalkThroughWindows ()
   from /usr/lib/libkdeinit_kwin.so
#10 0xa7f389f8 in KWinInternal::Workspace::qt_invoke ()
   from /usr/lib/libkdeinit_kwin.so
#11 0xa78425ac in KGlobalAccelPrivate::activate ()
   from /usr/lib/libkdecore.so.4
#12 0xa78a08cf in KGlobalAccelPrivate::x11KeyPress ()
   from /usr/lib/libkdecore.so.4
#13 0xa78a0b0c in KGlobalAccelPrivate::x11Event ()
   from /usr/lib/libkdecore.so.4
#14 0xa78c750f in KApplication::x11EventFilter ()
   from /usr/lib/libkdecore.so.4
#15 0xa7f36c26 in KWinInternal::Application::x11EventFilter ()
   from /usr/lib/libkdeinit_kwin.so
#16 0xa70a0423 in qt_set_x11_event_filter () from /usr/lib/libqt-mt.so.3
#17 0xa70ad68f in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3
#18 0xa70c72a2 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#19 0xa713b255 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#20 0xa713b17a in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#21 0xa712138d in QApplication::exec () from /usr/lib/libqt-mt.so.3
#22 0xa7f337ef in kdemain () from /usr/lib/libkdeinit_kwin.so
#23 0xa7c80eb0 in __libc_start_main () from /lib/tls/libc.so.6
#24 0x080483d1 in ?? ()