MANY THANKS to everybody who posted suggestions! We tried all of them. Unfortunately, none worked. We posted the same question to the IFI Robotics support forum, which led to an email, which led to a 45 minute phone call with IFI. After a few tests/diagnostics with our 2005 and 2006 robot controllers, the IFI tech decided we should ship our 2006 RC back to Texas. We FedEx-ed it overnight.
An IFI tech called us the next morning to report faulty soldering connected to the programming port! He repaired the problem. We have it back, and things are working fine now...
