I notice from other posts that there is a recognized issue with the new font awesome icon codes - they are not recognized by the Sydney theme. I have tried loading the WP Better FA plugin but this does not solve the problem as suggested.
This is a pretty key aspect of the design for the Services widget - can you confirm when it will be fixed? I changed my services section not knowing there was an issue and now I have two services with an icon and one with an empty circle - I really need a solid heart in there! - not looking great at the moment!