Have you sorted your throttle problem?
I am having similar issues.
I am using skid steer but have no output on the servo rail now.
It has been working fine.
I can see that the Cube is receiving the RC input but I have no output to the speed controller.
I can arm the vehicle no problem but still nothing.
It usually happens if you are using a non-bidirectional servo for a rover.
To solve this recalibrate the ESC, but the lowest point should be the middle position of your stick.
( when you give throttle it will still run from the bottom to the top )
To do this:
disable ALL safety features,
arm it
throttle up
plug the battery
wait for the ESC tone
pull down the throttle stick to the middle ( it helps if you have some visual confirmation with numbers on the TX LCD ).
It usually happens if you are using a non-bidirectional ESC for a rover.
To solve this recalibrate the ESC, but the lowest point should be the middle position of your stick.
( when you give throttle it will still run from the bottom to the top )
To do this:
disable ALL safety features,
arm it
throttle up
plug the battery
wait for the ESC tone
pull down the throttle stick to the middle ( it helps if you have some visual confirmation with numbers on the TX LCD ).