Can't unlock screensaver

I use a locking screen saver to conform to corporate security policy. Once in a while when I open my PowerBook, I find myself faced with a different Authenticate window than normal. The full text of the window is:
    You must authenticate to unlock the screen. Type
    an administrator's name and password to make
    changes to Mac OS X.
    Name: [       ]
    Password: [       ]
There is also a Details button that reveals the following when pressed:
    Requested right: system.login.screensaver
    Application: loginwindow
Unfortunately, nothing I can do will let me past that window other than forcibly rebooting the system with the power switch. My regular login is also administrator (shame on me, a security professional), yet neither my short name nor my long name works, nor does "root" with the root password.
I have not been able to find any reference to this problem by googling the text of the message nor by searching in any of these forum topics.
Please offer suggestions. I hate hard rebooting my machine.
PowerBook G4   Mac OS X (10.4.8)  

I am using wireless to an original Apple 802.11b Airport. No Windows anything is on the network.
Karl

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