fb.Login() window closes right away and returns 'not_authorized'

Question

I have FB login enabled on my website with the FB JDK. When I use it, it works perfectly: the dialog window opens, I authorize, and the authResponse is as expected. When another user uses it (who has not yet authorized the app, but is logged into FB), the login dialog appears for a brief second, and instantly disappears, and the response object has status not_authorized. Any ideas as to why the dialog might not be asking the user to authorize?

In my layout (Haml):

%body
  #fb-root
  :javascript
    window.fbAsyncInit = function() {
      FB._https = false;
      FB.init({
        appId      : <App ID>
        status     : true,
        cookie     : true,
        oauth      : true,
        xfbml      : true
      });
      FB.getLoginStatus(function(response) {
        if(window.reportFBstatus) {
          reportFBstatus(response);
        }
      }, true);
    };
    // Load the SDK
    (function(d){
     var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
     if (d.getElementById(id)) {return;}
     js = d.createElement('script'); js.id = id; js.async = true;
     js.src = "//connect.facebook.net/en_US/all.js";
     ref.parentNode.insertBefore(js, ref);
    }(document));

The login link:

%a{href: '#', onclick: 'FB.login(window.reportFBstatus, {scope: "user_about_me"})'}

In the Coffeescript:

window.reportFBstatus = (response) ->
  $.ajaxSetup({
    headers:
      'X-CSRF-Token': $('meta[name="csrf-token"]').attr('content')
  })
  console.log response # always shows status=not_authorized for other users
  if response.status is 'connected'
    auth = response.authResponse
    $.post('/login', {fb_id: auth.userID, fb_token: auth.accessToken}, (data) ->
      window.currentUser = data
    )

Answer 1

The solution that worked for me was actually a bone-headed one--I'd forgotten to change the app from sandbox mode to live mode in developers app console on Facebook (click your app on the left). Alternatively, I could have added the people I want to be able to log in as developers or testers.

Hope that helps others!