Hi Dan, have you set up a Wookong before or is this your first time around? Can you mention a bit more about how you have the WK wired to the R/C Receiver? You should have an Aux channel wired to the U port(on my Spektrum Rx it's the 'gear' channel (channel 5). If the WK unit is receiving a signal from the receiver on that port it should show a blue block somewhere along the GPS-FAILSAFE-ATTI-FAILSAFE-M line. If it's not receiving a signal those blocks above the U line will all be grey. Double check the wiring for ground, power and signal line?
MC Output Off is normal when you're connected to the WKM, it means the motors are disabled.