multiple output usb3 is grayed out

Hi
I'm using Virus TI with Logic and the multiple instrument with 3xout

But the third out, USB3, is not selectable. it is gray...

I have crated the AUX channel for it and everything.

My question was exactly the same as this question here:
http://virus.info/forum/index.php?page=Thread&threadID=2000

I think the solution in that thread will work for me as well.

Best regards