If you don't get any luck trying it with another midi controller let me know and I'll hook up my K2 and see if I can get it to work. If it works for me and not for you then we know it's not the controller and something to do with your specific traktor setup, and we can work from there to narrow it down.
I've recently mapped loop/size etc. using touch osc so it definitely works fine using the latest version of traktor, so I can't see any reason why it shouldn't work on a K2.
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