When I use the "Launch in Google+ Hangout" option it opens a hangout but then it says, "We've never seen this Google+ account before on Roll20. Before we take you to your game, we just want to make sure that you're really a new user and don't already have an existing Roll20 account." However, when I try to log in to my existing account it says "Not Found". That's it. Just "Not Found." I was able to use that link to start a hangout integrated campaign and my players just joined that but I had to use to direct launch link to be able to do anything.