Just a thought?? I used the adapter from my PC version on this Mac version. What I mean is I have a Futaba 12FG it has the square plug in back. I didn't find any adapters in the box that seemed to fit this transmitter so I just unplugged the one I have from donngel on the PC version and plugged it into the USB dongle cable on this Mac version. Perhaps that could be the problem??? However the program runs just fine with this adapter.