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Is this for the admin or main theme? Did you try updating the FontAwesome files?
Its working fine for me here, both on the demo and locally. So this might have something to do with your changes.
View your page source and check to see if the link tag href attribute is correct?
fa-calendar is work
fa-calendar-check-o is not working give square letter.
I have to link to online font awesome css to get fa-calendar-check-o to work.
It is weird. It works when using CDN link <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
I even copy online css to local font-awesome.min.css and not working too.
I maybe mess it up then. I will try start from scratch again