I haven't used them with the X400, but I have used them with Q-SYS a couple times. Are you trying to set this up with AES67 or Dante. The behavior of the commissioning page going away is expected, Dante is going to be unicast in most applications and Dante controller will handle the routing. If you are trying to use AES67, you just need to put the multicast stream IP (generated from the X400 AES67 output stream) in the AES67 receiver section of NAX. You shouldn't need to work with the commissioning tab I believe this is only used to set the multicast addresses of the internal streams for transmitting.?
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I dont think attachments are allowed in threads, but feel free to email me and I can send you some screenshots of the setup in NAX on a working setup.?