KIOSK + firestarter + /etc/sudoers problem

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Hello, I'm trying to configure /etc/sudoers in order to let user1 run
/usr/sbin/firestarter.

I've added this line:
user1 ALL=/usr/sbin/firestarter

The system tries to run it but ... nothing happens. In a system without
kiosk, it works. But in my KUbuntu 6.06 + Kiosk it does not work.

Please help...
Carlos
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