On my website, which is a Moodle website, I've added the script to the appropriate files. When i hover on a verse the box pop's up, but it says: "The Reference Could Not Be Loaded at This Time."
This might be a harder one to troubleshoot since you can only get to a reference once you are logged into the site though. However, based on that info, any ideas?
Website is http://online.cdimin.org
