Can't use NI Audio 2 with Jack - Audio Connection Kit

Hey,

i have a "little" problem with Jack...

My plan is to rout 4 decks from Traktor into Ableton (this does already work^^).



At the moment:
Traktor -> Ableton -> System-Output...


What i need:
Traktor -> Ableton -> Audio 2


The Problem is that everytime i hit "start" in jack, while my Soundinterface (NI Audio 2) is selected as soundinterface, the program crashs. I already changed pretty every paramter but it doesn't helped.

Here are some screenshots.
The first one shows the working settings, but without the soundinterface, the second one shows all options of the "interface"-parameter.

Attachment 17197Attachment 17198