>if you take off the fa-2x, do you see it?
>
I'm thinking that the font is not included in the page, as I see only:

  <link href="/Content/macadmintheme/css/bootstrap.css" rel="stylesheet"/>
<link href="/Content/macadmintheme/css/style.css" rel="stylesheet"/>
<link href="/Content/Site.css" rel="stylesheet"/>

I'll compare with the working pages.