Reply to Omnicontrol question

Hello,
I have Numark Omnicontrol question. 2 actually.

First - whenever Im scrolling thru my playlist with the track button and press, the song starts playing but I cant turn it off ! Any ideas ????

Second - I cant use the left side of the effect knobs. I press all the buttons but they dont light up. The right one works fine, reacts with the software - Im using Traktor Pro btw.

Any help GREATLY appreciated !