When using amarok to listen to mp3s or watch vids everything works fine.When I close amarok,more times than not I get a kde crash alert.everything still seems to work after the alert.I can play more mp3s etc with amarok afterwards and it still works fine.I posted the backtrace results below.Any help would be really appreciated.This is very annoying.
Thanks
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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 -1230988448 (LWP 8646)]
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[KCrash handler]
#7 0xb6c5ad24 in pthread_mutex_lock () from /lib/tls/libpthread.so.0
#8 0xb6cdc0af in _XUnregisterFilter () from /usr/X11R6/lib/libX11.so.6
#9 0xb6cc7590 in XrmDestroyDatabase () from /usr/X11R6/lib/libX11.so.6
#10 0xb6caf429 in _XFreeDisplayStructure () from /usr/X11R6/lib/libX11.so.6
#11 0xb6c9c71c in XCloseDisplay () from /usr/X11R6/lib/libX11.so.6
#12 0xb71254ee in qt_cleanup () from /usr/lib/qt3/lib/libqt-mt.so.3

Post it at the mailing list of amarok, you have more chance they can help you better then here, just a suggestion.
Did you try to update Amarok plus the plugins/engines?