Flex 3000: Blue Light on saying the radio is powered on. Green Light on back of the radio is lit saying the computer is talking with the radio via the Fire Wire. I click on SDR 2.7.2 icon I get "Available Radio Interfaces" screen. Demo slot is shaded indicating it is the only one available. Slot for my radio is not shaded indicating it is not available. That screen is as far as I can go. What is wrong?