I have the same controller and I experienced the same thing. I simply reset my controller to the stock settings and then the problem went away, then you can fine-tune it from there either with the radio or through the computer.. I’ve found it works better to program the MGM through the radio then through the computer.
Just a thought..
If you have the time review this thread, there is lot of extremely helpful and knowledgeable guys helping me out months ago with my MGM issues..
http://www.rc-monster.com/forum/showthread.php?t=11557
Best of luck working it out, the MGM is a awesome controller if you can getting working..