Seriously, sounds like a radio problem. Quickest way to determine that is to hook up your RS Pro to your buddy's radio (that is known to work) and test it out.
Conversely, you can hook up a known good speed control with your radio and if that behaves, it's the RS Pro...
Did you recalibrate your RS Pro to your throttle? I think all ESCs has some button or routine to get the end-points of throttle/brake and neutral point of a radio.
I'm sure you know, but CH1 on the receiver is for the steering servo, CH2 is for the speed control.