Something goofy with the software because the network like you say seems to be working on both units. While the software is the same, make sure it is also the newest version v8.01. If not working, backup your points and routes factory clear them both and then turn the master setting back on. Test the integration of waypoints and ensure it works. If it does, import in your points and test again. It might be that you have some corrupt user data keeping the flow from working or that the units just need a good clean out.