Version:            (using KDE KDE 3.5.2)
Installed from:    Slackware Packages
Compiler:          gcc version 3.4.6 Configured with: ../gcc-3.4.6/configure --prefix=/usr --enable-shared --enable-threads=posix --enable-__cxa_atexit --disable-checking --with-gnu-ld --verbose --target=i486-slackware-linux --host=i486-slackware-linux
Thread model: posix
OS:                Linux

KWin crashes every time I switch to another desktop (i.e. ctrl+f3) and afterwards I alt-tab for the applications that should be in the current desktop. After pressing alt-tab it opens the last used application, even if it is located on another desktop, and then KWin crashes rendering any action in kde unusable except accessing the taskbar.

Steps to reproduce:

1. Create multiple screens if you have just one.
2. Open two applications.
3. Move one of them in another screen/desktop.
4. Switch to that desktop and alt-tab there.

I'll post next a backtrace:

[KCrash handler]
#6  0x4180fc25 in KWinInternal::Workspace::nextFocusChainClient ()
   from /opt/kde/lib/libkdeinit_kwin.so
#7  0x41810b0e in KWinInternal::TabBox::createClientList ()
   from /opt/kde/lib/libkdeinit_kwin.so
#8  0x41812729 in KWinInternal::TabBox::reset ()
   from /opt/kde/lib/libkdeinit_kwin.so
#9  0x4181320c in KWinInternal::Workspace::startKDEWalkThroughWindows ()
   from /opt/kde/lib/libkdeinit_kwin.so
#10 0x41813328 in KWinInternal::Workspace::slotWalkThroughWindows ()
   from /opt/kde/lib/libkdeinit_kwin.so
#11 0x417f3c82 in KWinInternal::Workspace::qt_invoke ()
   from /opt/kde/lib/libkdeinit_kwin.so
#12 0x4082817a in KGlobalAccelPrivate::activate ()
   from /opt/kde/lib/libkdecore.so.4
#13 0x40829079 in KGlobalAccelPrivate::x11KeyPress ()
   from /opt/kde/lib/libkdecore.so.4
#14 0x4082920c in KGlobalAccelPrivate::x11Event ()
   from /opt/kde/lib/libkdecore.so.4
#15 0x40793e77 in KApplication::x11EventFilter ()
   from /opt/kde/lib/libkdecore.so.4
#16 0x4180d532 in KWinInternal::Application::x11EventFilter ()
   from /opt/kde/lib/libkdeinit_kwin.so
#17 0x40ba5c75 in qt_set_x11_event_filter ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#18 0x40bb33f8 in QApplication::x11ProcessEvent ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#19 0x40bc6f25 in QEventLoop::processEvents ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#20 0x40c31951 in QEventLoop::enterLoop () from /usr/lib/qt/lib/libqt-mt.so.3
#21 0x40c318a6 in QEventLoop::exec () from /usr/lib/qt/lib/libqt-mt.so.3
#22 0x40c1a38f in QApplication::exec () from /usr/lib/qt/lib/libqt-mt.so.3
#23 0x4180dba2 in kdemain () from /opt/kde/lib/libkdeinit_kwin.so
#24 0x40977774 in kdeinitmain () from /opt/kde/lib/kde3/kwin.so
#25 0x0804e474 in ?? ()
#26 0x00000001 in ?? ()
#27 0x0807e1e8 in ?? ()
#28 0x00000001 in ?? ()
#29 0x00000000 in ?? ()