I solved it by reinstalling my system;
But sounds VERY stupid to me to chmod a+r /etc/shadow, as every lamer with John
The Ripper can decrypt your password.
And as you have this problem, we can reopen this bug and you can help
more than I did :)
** Changed in: gnome-screensaver (Ubuntu)
Status: Invalid => Confirmed
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[Karmic] gnome-screensaver does not recognize correct password
https://bugs.launchpad.net/bugs/463166
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