I have 2 hubs now. I have the slave hub flag set to send mode updates from the master. However this seems to not be working. Is this a known bug, or am I missing something?
I believe this option sends the remote hub's mode changes to the "master" hub, not the other way around. You could use virtual switches and change mode based on switch state (I have a rule for this but Mode Manager can do at least some of this as-is), or you might consider the more powerful HubConnect, which can do this in either or both directions.
Documentation says Master sends to remote hub. But I tried it both ways and it doesn't seem to work.