knetworkconf cannot apply manual wireless settings : perl and kcmshell taking 100% cpu in Hardy and Gutsy

Binary package hint: knetworkconf

Knetworkmager do not manage hidden Wireless networks, so I tried to set it up in knetworkconf, with the following result, when I click on "apply settings", kcmshell and perl are both taking 100% CPU, and nothing else is happening, even if I wait more than 1 minute !

When I kill the perl process, I get following output from kde crash manager :
(no debugging symbols found)
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 -1233430848 (LWP 8131)]
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[KCrash handler]
#12 0xb6dabf78 in QTranslator::clear () from /usr/lib/libqt-mt.so.3
#13 0xb6dad88e in QTranslator::~QTranslator () from /usr/lib/libqt-mt.so.3
#14 0xb754353d in KDETranslator::~KDETranslator ()
   from /usr/lib/libkdecore.so.4
#15 0xb6dc4723 in QObject::~QObject () from /usr/lib/libqt-mt.so.3
#16 0xb6d5de4c in QApplication::~QApplication () from /usr/lib/libqt-mt.so.3
#17 0xb74b8999 in KApplication::~KApplication () from /usr/lib/libkdecore.so.4
#18 0xb7f1ad5a in kdemain () from /usr/lib/libkdeinit_kcmshell.so
#19 0x080484b2 in ?? ()
#20 0x00000006 in ?? ()
#21 0xbfa84464 in ?? ()
#22 0xbfa843d8 in ?? ()
#23 0x080484e9 in ?? ()
#24 0xb7f3e800 in ?? () from /lib/ld-linux.so.2
#25 0xbfa843e0 in ?? ()
#26 0xbfa84438 in ?? ()
#27 0xb7cba050 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
Backtrace stopped: frame did not save the PC