Being that this thread is also a help thread, I will give a try at solving your problem.
In my case, I had the same issue as you. I found that I needed the volume at the mic to be above at least 85dB's. Anything less and the measurements would not proceed even though I was getting the green in the channel test screen. Try upping the volume of the speakers by increasing the volume on the RS20i. Keep upping the volume until the measurement proceeds to the next channel.
I think interleave may have found some settings on his Cats needed resetting and combined with trying a new laptop that may have solved the problems. But you are spot on - we need to help each other out with our experiences to ensure this thread lives up to its name.