Hey there, seems like some people have problems with the fonts in this configuration. Due to heavy amount of work i cannot give you any other solution atm, apart from reading the other comments and responses.

I actually plan to devote some time this weekend to get around this thing so expect me to respond back again in 3–4 days. In the meantime i’d suggest using an external font library (like FontAwesome or Glyphicons).

Sorry for any inconvenience :/