Hi Guys, just trying to work out what is wrong with my MPG setup.

I'm using a BL-UsbMach3 v2.1 stepper driver board and have my MPG connected up to the MPG input pins on that board.
When I jog the Y axis, only one direction ever works. Its like it just ignores the wheel if I turn it in the opposite direction.
X and Z Axis both work fine as long as you jog the Y axis in the working direction first before you attempt to move them, otherwise they won't work at all.
I've tried both my home made MPG and a professional one (link here: https://www.futuremate.com/productdetail_en.php?id=65) in case the cheap rotary encoder I used on mine was the cause of the issue but both units present the exact same issue.

I've done a heap of googling and have found no other references to a similar problem so I'm hoping someone here may have seen it before and worked out how to solve it. My other option is to grab one of the wireless USB MPG's available and have a go with that but the reviews I've read on them don't seem as good as I would like.

Any input would be greatly appreciated. Cheers!