[MattForshaw]

Update: This is now resolved, and as is often the case, human error was to fault.

To provide some clarification for any other theme users encountering the same issue:

– Dante appears to use font-awesome (http://fortawesome.github.io/Font-Awesome/) for its icons, explaining the lack of reference to the image files included as part of the theme.
– The shortcode output only appears when social network profiles are specified in the Theme Options. There is a clear notice explaining that to be the case within the Theme Options page for Social Profiles, but this is something I had managed not to spot.

All the best,
Matt