Calibration problem

Nope, this is driving me insane now! Got the MMM to work fine by using FW V1.21, no worries there as it calibrated fine.

I have tried all sorts with the MM and my KO radio and just not having any of it to calibrate. I have tried increasing/decreasing EPA's, sub trims, trims, TDB on the ESC, all sorts. Plugged in a servo into the RX, worked a charm, throw looks great, no issues. Tried reversing the throttle channel, no luck at all. I have no ABS or anything fancy on the radio setup either.

Occurred to me that during use, I've never seen either the red or yellow LED light up at all, at any point, even during startup? is that normal? Beginning to think my MM has a problem maybe?