Version:            (using KDE KDE 3.5.6)
Installed from:    Ubuntu Packages
OS:                Linux

If I use option preview for Video or Audio with Konqueror, when I close it, Konqueror close normally but after a few second system shows a error screen.

******************************************************************************
The application unknown (konqueror) crashed and caused the signal 11 (SIGSEGV).
******************************************************************************

(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1231874384 (LWP 27425)]
[KCrash handler]
#6  0xb6967404 in pthread_mutex_lock ()
   from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb7dedbe6 in pthread_mutex_lock () from /lib/tls/i686/cmov/libc.so.6
#8  0xb6f18a7f in _XLockMutex (lip=0x8077d7c) at ../../src/locking.c:102
#9  0xb6f33abf in XrmDestroyDatabase (db=0x6b21) at ../../src/Xrm.c:2651
#10 0xb6f1a38c in _XFreeDisplayStructure (dpy=0x8129ff0)
    at ../../src/OpenDis.c:770
#11 0xb6f05e1a in XCloseDisplay (dpy=0x8129ff0) at ../../src/ClDisplay.c:74
#12 0xb71e2d14 in qt_cleanup () from /usr/lib/libqt-mt.so.3
#13 0xb725dc9e in QApplication::~QApplication () from /usr/lib/libqt-mt.so.3
#14 0xb78d8f09 in KApplication::~KApplication () from /usr/lib/libkdecore.so.4
#15 0xb685a915 in kdemain () from /usr/lib/libkdeinit_konqueror.so
#16 0xb7f9e524 in kdeinitmain () from /usr/lib/kde3/konqueror.so
#17 0x0804e4df in ?? ()
#18 0x00000004 in ?? ()
#19 0x0812b6d0 in ?? ()
#20 0x00000001 in ?? ()
#21 0x00000000 in ?? ()