Ok, first question. On what build are you? I would recommend to update to the leatest - which is 289182.

Then, have you installed the cows with the default pathes and settings? This is a god idea too.

Then, are all cows and the host application on the same port number? When I remember it right, in HyperVue you have to set it to the cow standard 5002 yourself - but i could be wrong. BUT, check it.

I would really recommend to use the ip addresses as identification for the other computers. On Mac nothing else works anyway.

One day your ship comes in - but you're at the airport.