Problems with Traktor Pro 2.1.1 and Kontrol S4

I've downloaded the latest update for Traktor Pro 2 (2.1.1) and tried it out this weekend. There are a couple of new features that I've enjoyed (like the keying of samples and selecting which to process by effects), but there is also a great setback when it comes to the general performance of the software.
I tried out the software on the internal soundcard before I did my gig and didn't