Thanks. I've found the problem based on the links you provided.

The clipboard API requires a secure HTTPS website to function. The first link you provided uses HTTPS on the main page, but not on the results page. I assume it's the same issue you're having on your local server ( no https ).

I've added some fallback code that seems to work, but the function is long depreciated, and may stop working at some point. Fixes will be in the next release.