Yes, there is an unintended feature (bug, I suppose you can call it)
in this build. Once two computer are talking to each other, it takes
4min before they can address each other by URL. So perhaps
wait a while and try.
Also, to make sure that your computers are talking to each other.
Look at the "Monitor" page, and make sure you see connections
whose state is "ready".
Best,
--Petar