In sharing settings (
Dashboard -> Settings -> Sharing -> Sharing Buttons), I have specified to use
Icon + Text.
In the dashboard live preview, they show up fine. However, on the front end of the site (Specifically: singular view), Twitter and Google Plus are missing their icons in the button output.
The following icons display correctly:
Email, Print, Facebook, and LinkedIn.
The following icons do NOT display correctly (missing icon graphic):
Google Plus, Twitter.