I purchased two of these as Christmas gifts and both units that I received are doing the exact same thing - the software portion is working fine but the sensors do not pick up any movement at all. I know they are the units specifically and nothing else in the set up because we plugged a different one in and it worked.
I, too, have called and emailed several times with no success.
Have you had any luck with anything yet? I think this is such a fun toy, but sadly my patience is running quite thin at this point. Let us know if you find anything that works and I will do the same!