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Icons Are Not Showing, Or Displaying Like Squares and Strange Characters

Please try to follow the instructions from this link in order to solve these errors: 

http://meyermed.com/2015/03/fix-font-awesome-icons-not-displaying/

These instructions work for all browsers and icon packs.

Most of the users were able to solve this cross-origin problem with the solution from that article, but if that does not work for you, you will need to contact your server provider and ask them to fix cross-origin issue, as it is server oriented.