title: Google Play Game Services: strange sign in behavior
body: <p>Recently I've added Google Play Game Services support in my app (added BaseGameActivity and GameHelper), and it sign-in and sign-out workflow worked fine. In my graphics thread I send message to main activity handler, it calls beginUserInitiatedSignIn or signOut. When identification process completes Game Helper calls onSignInFailed or onSignInSucceeded of my activity and I can check isSignedIn (true if onSignInSucceeded was called).</p>
  
  <p>But today I've found that it behaves strange now. Sadly that I did not backup last working version, but the essense code is the same. </p>
  
  <p>If I ask app to sign in it shows google services sign-in dialog (I have 2 accounts on my device). I choose an account, press ok, it returns to my app but neither onSignInSucceeded nor onSignInFailed is called (previously if I canceled this dialog I saw "unknown error" message).  When I try to sign in in the second time it launches a rotating circle and waits endlessly. If I tap on screen it aborts waiting and returns to my view. </p>
  
  <p>ALTHOUGH if I close the app and launch it once again, it signs in on launch successfully, call onSignSucceded and stay connected when I check in runtime. It says:</p>
  
  <pre><code>onCreate: creating GamesClient
  onStart.
  onStart: connecting clients.
  Connecting GamesClient.
  onConnected: connected! client=1
  All clients now connected. Sign-in successful.
  All requested clients connected. Sign-in succeeded!
  </code></pre>
  
  <p>If I sign out and then try to sign in again, it shows accounts dialog and writes:</p>
  
  <pre><code>isGooglePlayServicesAvailable returned 0
  beginUserInitiatedSignIn: starting new sign-in flow.
  Connecting GamesClient.
  onConnectionFailed: result 4
  onConnectionFailed: since user initiated sign-in, trying to resolve problem.
  resolveConnectionResult: trying to resolve result: ConnectionResult{statusCode=SIGN_IN_REQUIRED, resolution=PendingIntent{41f8a610: android.os.BinderProxy@41f8a5b0}}
  result has resolution. Starting it.
  </code></pre>
  
  <p>When I choose an account it returns to my activity and neither onSignInSucceeded nor onSignInFailed is called. If I check in runtime I see that app is not connected to google services.
  When I try to sign in again it shows forever rotating circle and says:</p>
  
  <pre><code>isGooglePlayServicesAvailable returned 0
  beginUserInitiatedSignIn: continuing pending sign-in flow.
  resolveConnectionResult: trying to resolve result: ConnectionResult{statusCode=SIGN_IN_REQUIRED, resolution=PendingIntent{41f8a610: android.os.BinderProxy@41f8a5b0}}
  result has resolution. Starting it. 
  </code></pre>
  
  <p>When I tap the screen, circle is aborted without calls to onSignInSucceeded nor onSignInFailed and so on.</p>
  
  <p>I can't imagine what went wrong. Handler is created on main thread. I have Google example, and it signs in and signs out without any problem, just like my app did. Can somebody tell what can be wrong? Thanks!</p>