playgameservices + iOS problem after coming back from Sign In

I read elsewhere on here that iOS does some weird things when switching apps, and I think that might be related to the problem I'm having.

I am using play game services for leaderboard and achievements. When I send the login attempt, iOS switches over to a web window and asks if I will allow the app to access my profile, etc. When I accept, it takes me back to the app, but it is the launch screen again.

None of the GPG functions work, and in xcode it's showing me that the debig of "reportscore is only available after authentication" etc. etc.

Any ideas how to get the gpg login to not restart the game?