title: Users don't see facebook app permissions when run it
body: <p>Good day.
  With my web application I allow my customers to publish photo albums on their facebook pages logging in a social network with own accounts. In order to make it, I have created a public facebook app and setted the customers as tester. For publish the album I have created a javascript routine. For some of them, when clck on a button of a web application that publish the album, the request to allow the app tyo make it not is displayed and the operation not is executed. Nothing javascript error appears on a browser console. The popup block in a browser is disabled. Why?
  Best regards.
  Stefano Errani</p>