Version:            (using KDE 4.0.3)
Installed from:    Ubuntu Packages
OS:                Linux

after logging in, kde window decorator crashes. the following message is displayed:

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[Thread debugging using libthread_db enabled]
[New Thread 0xb6e8d6c0 (LWP 6440)]
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[KCrash handler]
#6  0x08059abe in ?? ()
#7  0x0805be98 in ?? ()
#8  0xb7f4ae72 in KDecoration::setMask () from /usr/lib/libkdecorations.so.1
#9  0xb6bf25f9 in CrystalClient::updateMask ()
   from /usr/lib/kde3/kwin3_crystal.so
#10 0xb6bf8544 in CrystalClient::init () from /usr/lib/kde3/kwin3_crystal.so
#11 0x0805b951 in ?? ()
#12 0x08054c05 in ?? ()
#13 0x0805521c in ?? ()
#14 0xb7f6e9f7 in dbus_connection_dispatch () from /usr/lib/libdbus-1.so.3
#15 0xb7168893 in DBusQt::Connection::dispatchRead ()
   from /usr/lib/libdbus-qt-1.so.1
#16 0xb7169147 in DBusQt::Connection::qt_invoke ()
   from /usr/lib/libdbus-qt-1.so.1
#17 0xb776c704 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#18 0xb776d1e9 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#19 0xb7169b29 in DBusQt::Internal::Integrator::readReady ()
   from /usr/lib/libdbus-qt-1.so.1
#20 0xb7169c0f in DBusQt::Internal::Integrator::slotRead ()
   from /usr/lib/libdbus-qt-1.so.1
#21 0xb7169c8a in DBusQt::Internal::Integrator::qt_invoke ()
   from /usr/lib/libdbus-qt-1.so.1
#22 0xb776c704 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#23 0xb776d051 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#24 0xb7afcb99 in QSocketNotifier::activated () from /usr/lib/libqt-mt.so.3
#25 0xb778e766 in QSocketNotifier::event () from /usr/lib/libqt-mt.so.3
#26 0xb7700c36 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#27 0xb7702a5f in QApplication::notify () from /usr/lib/libqt-mt.so.3
#28 0xb7ec1672 in KApplication::notify () from /usr/lib/libkdecore.so.4
#29 0xb769128d in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#30 0xb76f2b4a in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/libqt-mt.so.3
#31 0xb76a6630 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#32 0xb771bf90 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#33 0xb771bc8e in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#34 0xb77027df in QApplication::exec () from /usr/lib/libqt-mt.so.3
#35 0x08054351 in ?? ()
#36 0xb6f03450 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#37 0x08051a21 in ?? ()