The FAQ states that your devices have to be on the same subnet. Had you actually followed the FAQ, your ping test would have failed.
As to why it worked before, I don't know. Maybe you were connected to the one router and not the other. You didn't really provide any info on what you tried or any indication that you read the FAQ, so trying to troubleshoot that for you is a bit difficult.
As to how to properly setup your home network for two routers, that's outside the scope of this forum. Try searching the Google instead - http://compnetworking.about.com/od/rout ... etwork.htm
P.S.: with the current tone of your posts (especially after waiting less than a day for a response), you'll get little support here, at least from me.