I recently started doing some marketing and web design for an interior design company, and we need to get the company’s account on Houzz.com tied in to the main website. I haven’t had any problems tweaking the other social networks, but for some reason when I try to use the “fa-houzz” icon I get a plain, white circle in the place where the Houzz icon should be, and it isn’t functional as a link. I’ve swapped out various other icons with the same URL to test it, and the icons come up just fine. I’ve come to the conclusion that it must be something with how the “fa-houzz” icon is coded as that seems to be the one unique thing that I can’t seem to get to work. If you have any advice or suggestions I’d love the help!
If I were in your spot, I would check to make sure that the right version of the FontAwesome library is being loaded. It looks like that icon was added in v4.4, perhaps your site is loading an older version for some reason.