Font Awesome Icons - some icons don't display

Some icons don’t work and my site displays an empty circle. Examples: fa-universal-access; fa-sign-language. Does the fa library in Sydney need to be updated?

Hello there,

The version of Font Awesome which is included in the Sydney theme is outdated. Sorry for inconvenience. Alternatively, you can use the Better Font Awesome plugin to load the latest version.

Regards,
Kharis