Hi,
Having the same issue with fontawesome fonts not showing.
I havent updated from a previous version of your theme.
My font-awesome.min.css tells me the fonts are version 4.30
Theme version is 2.82
Wordpress version 4.4.2

This is a shortcode snippet i pulled from one of the demo themes in my wordpress:
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[sf_iconbox image=’ss-like’ type=’left-icon’ title=’Powerful yet simple’ animation=’fade-in’ animation_delay=’200′]Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Nulla nunc dui, tristique in semper vel.[/sf_iconbox]