title: Google Play Games Services Leaderboard API, can't see other players' scores
body: <p>I am developing an Android app in which I use the Google Play Games Services API.  I have successfully implemented leaderboards in every aspect except I can't see the scores of other players, only my own currently signed-in player score is shown.</p>
  
  <p>It acts as if my tester users have not shared their game activity with the the current user, but in fact they have, and this fact is visilble in their accounts.  I have also confirmed that the current user shares the app with these other tester users.  UPDATE: I can see the other scores using "All", but not in "Social". Still, why aren't scores available in "Social"?</p>
  
  <p>I use this GoogleApiClient:</p>
  
  <pre><code>mGoogleApiClient = new GoogleApiClient.Builder(this)
                  .addConnectionCallbacks(this)
                  .addOnConnectionFailedListener(this)
                  .addApi(Plus.API).addScope(Plus.SCOPE_PLUS_LOGIN)
                  .addApi(Games.API).addScope(Games.SCOPE_GAMES)
                  .build();
  </code></pre>
  
  <p>I can switch accounts, sign-in, submit scores, etc. for each account successfully, but I simply can't see the other tester accounts scores when I start the leaderboard activity.</p>
  
  <p>Any ideas on where to look?</p>