Requests from referer are blocked

I noticed that on a site I developed, I am getting this “Requests from referer are blocked.” This used to work, and I’m not sure when it stopped working. I’ve checked the Credentials in Google Developer Console, and even tried removing the website restrictions and selecting No Restrictions, and I still get this error. I double checked the API key, and it is correct. Anyone have any ideas to help get this working?

Thanks!

The page I need help with: [log in to see the link]