Reply to Mixtrack - Traktor Pro 2 mapping

Can anyone help?
I have just moved over to Traktor from M-Audio's Torq/Xponent. I now use the midi control Numark Mixtrack with Traktor Pro 2. The only problem with this is that it is supposed to be mapped already (that is the reason why I purchased this model) but the effects section on deck B of the Mixtrack does not work (as if they are not mapped) has anyone else come across this problem and is there a fix? Or should I go back to NI?

Stu-J