Error entering administrator name & password to make System Prefs changes

I have been running Leopard with just fine but encountered this new problem today. I wanted to create a "Guest" account, but when I clicked on the lock in the System Preferences: Users screen to add that option, I typde in my administrator name & password and got this error:
"Sorry, you entered an invalid username or password. Please try again."
It accepts my password when logging in, for keychain access, etc... But I'm not able to unlock & make changes with the same username & password. I tried logging in to make the changes in System Preferences under another user who is also an admin, but I got the same error message using that user's name & password.
This is a new problem for me. I unlocked & added a user account for my kids with no problems just last week and haven't made any changes to my password or account name since then.
Any thoughts on how to fix this issue? Thanks in advance!

I'm having a similar problem, since the 10.5.1 upgrade (I downloaded the 110MB version, as Apple readily admits that there are problems when using Software Update for upgrades).
I ran Disk Utility to repair permissions on my boot drive, and it prompted me for my administrator password (something that I've only had to do since the upgrade to 10.5). This time, the user name was blank (usually it fills in the user name with the account name I'm logged in under). I entered the information, and got the error. Double checked everything, and still no luck. After a third attempt, I was told I had to wait a while before trying again.
I'm hoping there's some simple fix or something I can easily to type in. I don't want to wait a few more weeks for Apple to release another patch, and I don't want to have to step back to an even more unstable version so I can use Disk Utility.
~Trilo~

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    I'm not sure about the status of that bug in 2.2.5, but it has been
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    -Fred
    Weidong <[email protected]> wrote:
    We are using KODO 2.2.5 right now and We have business requirement that we
    should not keep database user name and password in system.prefs. I
    followed the instructions that you wrote in Feb 12 2002 post. But it still
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    Fred Lucas
    SolarMetric Inc.
    202-595-2064 x1122
    http://www.solarmetric.com

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