Is your Theme using the Font Awesome Icons plugin: https://wordpress.org/plugins/font-awesome/ or using Font Awesome Icons directly from Font Awesome? If you do not know that information then it is not that important here. The problem may or may not be related to or caused by BPS so if adding that code to BPS Custom Code does not fix the problem then you will need to do the BPS Pro troubleshooting steps: http://forum.ait-pro.com/forums/topic/read-me-first-pro/#bps-pro-general-troubleshooting to confirm, eliminate or isolate which BPS Pro feature is causing the problem.
Another possibility worth mentioning is that Major CSS changes were made in WordPress 4.4 so clearing your Browser and plugin cache would be a very good idea.
Do these steps to add your custom code above to BPS Custom Code:
Note: The BEGIN WordPress and END WordPress placeholder text should never be used for anything except the standard WordPress Rewrite block of code. Placeholder text should be unique to all unique code. Placeholder text or any plain text should always be commented out with # signs or your website will crash.
1. Copy your custom code below to this BPS Root Custom Code text box: CUSTOM CODE TOP PHP/PHP.INI HANDLER/CACHE CODE. Important: Your custom code needs to be added above any custom htaccess code that you are already using if you are using any custom htaccess code in that Custom Code text box already.
2. Click the Save Root Custom Code button to save your Root custom code.
3. Go to the Security Modes page and click the Create secure.htaccess File AutoMagic button.
4. Select the Activate Root Folder BulletProof Mode Radio button and click the Activate|Deactivate button.
# BEGIN Font Awesome Icons Fix <IfModule mod_headers.c> <FilesMatch "\.(eot|font.css|otf|ttc|ttf|woff)$"> Header set Access-Control-Allow-Origin "*" </FilesMatch> </IfModule> # END Font Awesome Icons Fix