Reply to Mfp + mf

Right, so this might be me being pretty stupid. But I'm currently running a VCI100 Arcade, X1, MF Pro & MF using TP2.

At first when the MF Pro arrived I couldn't get anything on it to work apart from the buttons. Now I've got that working I've lost the MF. I want the MF Pro on Deck A, which it is, and the MF Pro on Deck B. Which it doesn't seem to like. I'm running the Instant Gratification Mapping, and in the controller manager I have no idea what I need to change to get it to work on Deck B. (I *have* tried setting its focus to Deck B)

Help!