Perhaps this bug has to do with the PAM configuration.
Related bugs in Gnome https://bugzilla.gnome.org/buglist.cgi?quicksearch=screensaver+password
Gnome FAQ http://live.gnome.org/GnomeScreensaver/FrequentlyAskedQuestions#Why_does_the_screensaver_unlock_dialog_always_think_my_password_is_invalid.3F
Perhaps this bug has to do with the PAM configuration.
Related bugs in Gnome /bugzilla. gnome.org/ buglist. cgi?quicksearch =screensaver+ password
https:/
Gnome FAQ live.gnome. org/GnomeScreen saver/Frequentl yAskedQuestions #Why_does_ the_screensaver _unlock_ dialog_ always_ think_my_ password_ is_invalid. 3F
http://