"Other" icon missing after upgrade to 10.3

I am having a problem with some (not all) of my Macs. They were running 10.2 with a static IP address. I upgraded them to 10.3.3 and changed them to DHCP (Panther server with AD active). After doing all that the 'Other' icon is not showing up on the login screen for some machines. Short of wiping the HD and reinstalling 10.3.3 (which I did on some already), can someone tell me why this is happening and how to fix it? TIA.