Help U46 mk2

Hi,
I've looked everywhere for my problem, and I really can't find a solution. Let me first explain my setup.
I want to use Traktor Pro with 3 Decks. Therefore, I bought the MixVibes U46 mk2, which has 6 outputs (3 stereo) and 4 inputs (2 stereo) and is supposed to be full duplex.
So, I have physically routed the outputs 1-2, 3-4 and 5-6 to stereo channels on my mixer (I have a Behringer DX2000USB). The output of the Behringer mixer goes to the inputs 1-2 on the U46 mk2. Deck A uses outputs 3-4, Deck B uses outputs 5-6 and Deck C should be using outputs 1-2 (this is for historical reasons).
However, for some reason, the outputs 1-2 ALWAYS carry the signal of the playing Decks A or B (which, as said, use outputs 3-4 and 5-6). It also happens with Cross LE, by the way (so it doesn't seem to be a Traktor problem).
I have looked inside my Windows 7 sound configuration, and I can't find any setting that resolves the issue. I have installed the latest drivers and even tried to use Asio4All drivers, to no avail, as you may have guessed....
What am I missing? Can anybody shed some light on this? I am at my wits end and am considering replacing the U46 mk2, for instance, with the much more expensive Native Instruments Audio8 (although I want to make sure it's not some weird Windows setting, because then it might happen with any other multi-channel sound card as well)... Such a waste of money if it turns out that the U46 mk2 isn't capable of doing full-duplex 4-in 6-out audio...
Thanks!
Sander
I've looked everywhere for my problem, and I really can't find a solution. Let me first explain my setup.
I want to use Traktor Pro with 3 Decks. Therefore, I bought the MixVibes U46 mk2, which has 6 outputs (3 stereo) and 4 inputs (2 stereo) and is supposed to be full duplex.
So, I have physically routed the outputs 1-2, 3-4 and 5-6 to stereo channels on my mixer (I have a Behringer DX2000USB). The output of the Behringer mixer goes to the inputs 1-2 on the U46 mk2. Deck A uses outputs 3-4, Deck B uses outputs 5-6 and Deck C should be using outputs 1-2 (this is for historical reasons).
However, for some reason, the outputs 1-2 ALWAYS carry the signal of the playing Decks A or B (which, as said, use outputs 3-4 and 5-6). It also happens with Cross LE, by the way (so it doesn't seem to be a Traktor problem).
I have looked inside my Windows 7 sound configuration, and I can't find any setting that resolves the issue. I have installed the latest drivers and even tried to use Asio4All drivers, to no avail, as you may have guessed....
What am I missing? Can anybody shed some light on this? I am at my wits end and am considering replacing the U46 mk2, for instance, with the much more expensive Native Instruments Audio8 (although I want to make sure it's not some weird Windows setting, because then it might happen with any other multi-channel sound card as well)... Such a waste of money if it turns out that the U46 mk2 isn't capable of doing full-duplex 4-in 6-out audio...
Thanks!
Sander