My wife kindly bought for me the new Firefly V2 mousemat for Xmas.. Seem to have an issue in that my Mamba doesn't track on it properly, it stutters all over the place. Moving the mouse back to my cloth mouse pad, it all works fine. I thought OK maybe its needs calibrating for that mouse mat. But the calibration fails. I can use the mouse on the Firefly's box perfectly fine.. it just appears to only be an issue on the Mouse mat itself.. which kind of defeats the object really!? Is there something i'm missing?