We have been replacing all our light switches with Insteon Smart Switches (http://cache-m2.smarthome.com/manuals/2477d-en-03-26-2015.pdf page 11) to control them via our phones. Ultimately, they work they hookup the same way as regular switches except for 3 way and more switches rather than using a traveller to connect related switches that process is done wirelessly so travelers get capped line goes to hot, and load goes to cold. We've set everything up successfully except for one location.
It use to be a ceiling fan (light and fan) but we previously replaced it with just a light. It's 3 way, so one 2 gang has a switch for the light and previously connected fan, and the other gang also has a switch for the same light and the previously connected fan.
We hooked up the new switches, one works, the other does not, and ends up blowing the fuse. When hooking up neutral wire to either light or fan switch in Entry. 
On the ceiling light there is a red capped off and a black attached. And of course neutral and ground.
Does anyone have any thoughts on what I can test or get to the bottom of this or more information I can provide? Thank you!
Best Answer
I'm not getting a very good picture from your diagram. From what I can tell the switches aren't shown? Or maybe they are but the light isn't? Anyway here's what seems to be going on: The switch that blows the breaker could have a neutral or ground wire connected to the load side of the switch. When the switch contact is made you have a dead short. OR the wire that's supposed to be "hot" coming into the switch is actually a neutral or ground. To troubleshoot this I would use a volt meter. Turn off power. Remove load line from switch that blows breaker. Turn power on. If the breaker blows with the load line removed then the switch is bad. If it doesn't then connect one lead of voltmeter to ground (non insulated wire) and the other lead to the load side of switch. Turn the switch on and tell me the results.