Reply to Mixtrack problem with play instant and release button

Hey there,
I bought a Numark mixtrack last week which comes with Traktor LE.
Everything its fine except for the right Play button. When I press it, nothing happend, but when i release the button the song starts to play. The left Play button is working fine... but the right one play the song when I release it. I already tried the preferences on Tracktor Transport (instant/release option) and it will not work. Any suggestions please ?