I downloaded RC7 to my mac mini, have a DX6i transmitter and plugged in a Spectrum WS1000 dongle. All seamed to go well BUT all the simulator models (plane or heli) start out with engines running. I have not been able to shut off the props or blades using the throttle stick on my transmitter, I can only increase the speed but not shut it off. Can anyone please tell me what I'm doing wrong?