Nomad for Mac drops connects and drops DMX?

I'm trying to use a Nomad dongle to run 2 universes of DMX though a Gadget II.  I'm running over an older Macbook pro 13" and headed into my dimming system via a net2 input node. It seems to connect initially and bring up the loaded Cue and relays, but within 2 seconds it dumps all DMX.  If i fire another cue, it will bring those lights up again for a moment and then dump them again.  Any thoughts?