Facebook Web App development error
These errors happen when loading scripts and other external resources (such as images) on other domains via HTTP when the main page (which is your Facebook app, in your case) is loaded via HTTPS.
Look in the code of your app, use protocol relative URLs when calling external scripts. For example, instead of this:
<script src="http://connect.facebook.net/en_US/all.js"></script><script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script><link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.1/themes/base/jquery-ui.css">Do this:
<script src="//connect.facebook.net/en_US/all.js"></script><script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script><link rel="stylesheet" type="text/css" href="//ajax.googleapis.com/ajax/libs/jqueryui/1.7.1/themes/base/jquery-ui.css">Edit: Note that if protocol relative URLs are used on stylesheets, IE7 and IE8 will download it twice:http://paulirish.com/2010/the-protocol-relative-url/