Often enough applications crashed while trying to open them.

Often enough applications crashed while trying to open them. Programs like firefox, totem, vlc, kaffeine and also games like gnometris doesn't run.
It's hard to report bugs, because i dont obtain a backtrace/bug report request till the next restart.
Could be a gconf server problem?

I attach the last backtrace i was able to obtain.

thanks for your engagement

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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1232410400 (LWP 5534)]
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[KCrash handler]
#6 0xb61a04c4 in TaskContainer::updateKickerTip ()
   from /usr/lib/libtaskbar.so.1
#7 0xb65e7f72 in KickerTip::display () from /usr/lib/libkickermain.so.1
#8 0xb65e84ef in KickerTip::qt_invoke () from /usr/lib/libkickermain.so.1
#9 0xb72b388b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#10 0xb72b4330 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#11 0xb7641ba6 in QTimer::timeout () from /usr/lib/libqt-mt.so.3
#12 0xb72db596 in QTimer::event () from /usr/lib/libqt-mt.so.3
#13 0xb724aa60 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#14 0xb724c88f in QApplication::notify () from /usr/lib/libqt-mt.so.3
#15 0xb7952ce2 in KApplication::notify () from /usr/lib/libkdecore.so.4
#16 0xb71dd1e9 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#17 0xb723d4ab in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#18 0xb71f1d25 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#19 0xb7265136 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#20 0xb7264f46 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#21 0xb724c609 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#22 0xb66f47c2 in kdemain () from /usr/lib/libkdeinit_kicker.so
#23 0xb7fce464 in kdeinitmain () from /usr/lib/kde3/kicker.so
#24 0x0804e6bf in ?? ()
#25 0x00000001 in ?? ()
#26 0x080a2e88 in ?? ()
#27 0x00000001 in ?? ()
#28 0x00000000 in ?? ()