Version:            (using KDE 4.0.1)
Installed from:    Ubuntu Packages
Compiler:          gcc (GCC) 4.2.3 (Ubuntu 4.2.3-1ubuntu2) 
OS:                Linux

After having set up filesharing to allow all users to share files:
Load the properties of some folder, switch to the filesharing tab, select to share this folder in local network, further select share with samba and click on the options button.
a new windows will appear containing five tabs, allowing you to change various options.
click on hidden files -> crash

(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xb63e8720 (LWP 14094)]
[New Thread 0xb4dfcb90 (LWP 14095)]
[KCrash handler]
#6  0xb7fd4410 in __kernel_vsyscall ()
#7  0xb6be4f35 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb6be68b1 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb7e80a75 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb7e80b38 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb7e80cd5 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb420e7e0 in ?? ()
   from /usr/lib/kde4/lib/kde4/fileshare_propsdlgplugin.so
#13 0xb423bc63 in ?? ()
   from /usr/lib/kde4/lib/kde4/fileshare_propsdlgplugin.so
#14 0xb423bbbc in ?? ()
   from /usr/lib/kde4/lib/kde4/fileshare_propsdlgplugin.so
#15 0x00000070 in ?? ()
#16 0xb424453c in ?? ()
   from /usr/lib/kde4/lib/kde4/fileshare_propsdlgplugin.so
#17 0xbf9b2834 in ?? ()
#18 0x08556510 in ?? ()
#19 0xbf9b27e8 in ?? ()
#20 0xb420dc85 in ?? ()
   from /usr/lib/kde4/lib/kde4/fileshare_propsdlgplugin.so
#21 0x0855654c in ?? ()
#22 0x00000001 in ?? ()
#23 0xbf9b2834 in ?? ()
#24 0x00000001 in ?? ()
#25 0x0000008b in ?? ()
#26 0x00000001 in ?? ()
#27 0x00000000 in ?? ()
#0  0xb7fd4410 in __kernel_vsyscall ()