When you try to configure the default Gateway for the secondary Ethernet port in the TCP/IP settings of your MAC36NL, after the controller has rebooted do the settings disappear?
Is your MAC 36 Controller telling you have exceeded your point limits for the local IO when you know that you haven’t ? Have you tried to re-commission and reboot the controller but it’s still not...
Have you ever had an issue iSMA room controllers that were all set with the same DIP switch and LCD displays screens set to default, but they were operating differently in function and display?