Having a bizarre problem on my Mac and was hoping you guys could help.
My main user that I use every day is no longer allowed superuser privileges in the GUI. For instance, if you go to System Preferences/Accounts and 'Click the lock to make changes' it will always reject the password I enter with the message 'Try entering your information again.' and an 'OK' button.
I figured that the user had dropped out of the admin group but that is not the case. When I use 'groups' you can see that it is clearly there. I also have no problems using su & sudo from the command line. When you check the user with dscl it is still in the admin group.
I added another admin user from the command line using dscl and used that to remove and then re-add admin privileges from my main user but that didn't work.
I've also tried running Disk Utility and Repair Permissions but that hasn't worked either.
Am running a MacBook (early '09) with the latest version of Snow Leopard (10.6.2)