Problem with Recognition of Admin's Name and Password

I am having issues with my system not recognising my admin name and password. For example if I click the lock on the Accounts Preferences page to make changes or try to shut my system down with other users logged in I get a similar message telling me the admin name/password authentication pair is not recognised. I believe other apps which use the admin name/password have similar problems. Also Software Update won't run as it won't recognise the admin name/password pairing.
However I can login using the name/password pair and I can open the login Keychain with this name/password pair. Just to check my kids hadn't changed the admin login I have changed the password using the reset password utility on the installation disk but the problem remains.
I have a nagging suspicion that a HD clean up utility may have done something but this could be a red herring
Any ideas? My only ideas left are to set up another admin account to see if this cures things but I suspect if it does and I try and use this new account I will end having to change the admin privileges of files throughout the system! I also have the option of using a bootable clone startup disk I made a couple of weeks ago using Carbon Copy Cloner but I am not sure if the problem existed then.
Any help welcomed!

Solved!
But to be honest I'm not sure really how. I had to switch the mac off using the power off switch (as I couldn't shut down from the GUI). Then I started it up holding down the 'D' key - in fact I did this on the wrong basis as I thought this would allow me to boot up from my clone external startup disk (it doesn't - it forces the internal hard drive to be the boot drive not an external one). 'D' must also stand for Divine inspiration. I then found the problem to have gone so I took the opportunity to verify and repair permissions using Disk Utility - there were a few repairs required on system level looking files) and everything seems fine (fingers crossed)

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