API Key domain not enabled

Hello,

I was able to get this plugin working earlier this year. It seems that all of a sudden, a few months ago, the plugin stopped accepting my API keys. I have reset the API key a dozen times, with a bunch of possible URLs, and I have been unable to get it to work. Any help from anybody would be extremely welcome.
Thank you,

Victor

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