Users in a domain lock their computers. When they return and attempt to
unlock the computer they are unable. We have confirmed that the user account
is not locked. After resetting the user's password they receive the following
message when they attempt to unlock the computer:

"Please change your password at another machine and retry or contact your
Domain Administrator".

Users are not allowed back into the computer. Our only workaround has been
to reboot the computer. Once the system has been rebooted the users can log
in.