Update:
We solved the problem via email. The problem was totally on my end.
On one of our test systems, we somehow managed to install the
FRC easyC 2.0 upgrade, not the
FVC one. I'm still amazed that we managed to update the MasterCode on our little Vex controller with a FRC file.
Our other test system was running Windows 98 with Internet Explorer 5.5. Apparently, the easyC 2.0 registration mechanism prefers IE6. An IE service-pack later, problem solved.
I'd like to thank Adam & Intelitek for the tech support & helping us get this running.
Thanks!