Hi Simon!
I´m running only 1 test universe in my setup.
The Mac IP Adress is not the same as any artnet interface and should be in the correct range. The 2nd network port is not in use and off.
The PM DMX Universe is directed to a specific artnet box (Etherlynx)
There is nothing else running on my network.
Thanks for your response.
Attached you can find my screenshots!
Regards,
Holger