I am having the same problem. When I try to troubleshoot, this is the error that I get:
Refused to display 'https://www.facebook.com/login.php?sk...' in a frame because it set 'X-Frame-Options' to 'DENY'.
Uncaught SecurityError: Sandbox access violation: Blocked a frame at "http://appery.io" from accessing a frame at "http://appery.io". The frame being accessed is sandboxed and lacks the "allow-same-origin" flag. jquery-1.8.2.min.js:2