Everything looks great there. You are plugging the ESC directly into the THR port on the 3GX, correct? Try plugging in some servos and see if that does anything.
Did you do what I stated above and plug in some servos like you were getting it ready to fly? And did you plug the ESC into the THR port? I need help with the questions in order to help out. YOu need to plug in some servos to see if anything is moving.
You guys are exactly right. I was looking at the 3GX and didn't even pay attention to the Rx. The signal wires need to be closest to the label. Flip them around and I will bet everything starts working.
Once it's bound, the Tx learn the receivers unique code and it will stay bound no matter if you remove the wires or not. You will be fine unplugging them and plugging them back in.