I have enabled fast user switching under 10.4.6, with 4 accounts on the system.

After rebuilding the accounts from a backup (after hdd replacement), one account (a managed account) doesn't show the user name in the top right corner so you can switch users. Other accounts on the system (including a managed account) do allow fast user switching.
Family controls are NOT switched on for Finder & System.

Any one have any ideas on what is happening here?

Glenn.