How to recognize new NIC on ESXi?

We have ASG 8.3 running as a VM on ESXi 4.1. We had it running with 3 NICs just fine. But I want to add a 4th NIC for another subnet. So I shutdown the VM and added another virtual NIC. All NICs are set to "flexible". Upon rebooting, the ASG does not seem to recognize that that is another NIC. Is there something else I need to do or is this some kind of bug or limitation?

Any advice here would be great - thanks in advance!

-Jeremy