I have a single user in our system that no longer works with us.  I go into User Maintenance and Click the check box to Lock the account and the date in the upper right fills in with today's date for account expiration.  I click accept. Then as soon as I go back into that users maintenance screen, it is unlocked again.  Doesn't happen with any other user in the system.  What would cause a user to be unable to lock?  Suggestions to fix?

Thanks,

Ryan