any idea's?
As a matter of fact, yes. Add some serial output. Are you receiving what you think you are?
The move() function on the receiver is passed an array of chars. It expects a char. Fail!
Some of the motor control wires control direction, and should be connected to non-PWM pins, with digitalWrite() used to control them. Do the motors do what they are supposed to with a simple sketch on the receiver?
What, exactly, is connecting the two Arduinos?