If you are unable to disconnect users from the "Show Live Users" screen, follow these steps:
  1. Get any connected users to log out of FIMS (other than the user(s) that cannot be disconnected)
  2. Stop the database(s).  You can use the Show Live Users "2 - Unconditional Shutdown" option OR if there's the "stop all databases" shortcut on the desktop you can use that (Note this one will stop the other databases (demo and others (if applicable))).
  3. Start the database(s).  Use the "start all databases" shortcut on the desktop.
  4. You can check that the user(s) has been disconnected by running "Show Live Users" again.