Midi notes not processed

Having issues today with midi notes not being processed after a second server joins the session. Both consoles (on current release s/w) are set to the same net numbers, and both have internal DP’s set to the same net numbers. Consoles on separate IP addresses. Main console only receives and precesses incoming midi notes when the second console is not logged in and is offline. I don’t remember this ever being an issue in the past.