I didn't get a problem going to that page (when I tried), but basically you are looking for situations where there is mixed content on your page(s). This often occurs if on a secure page and there is an image with a link to an insecure location: srv="http:

This can be seen/found by viewing the source of the page, then searching for http: the solution is either to present the uri with the method used to call the page ($request_type is the variable that helps identify that situation) or to make calls that reach an outside server by use of "//servername.extension/path-to-image/image".

There are a few other cases that will cause this issue, but should check for those first. Sorry I couldn't do the search myself, but the device I am on is not cooperating. :)