I just tried adding that Pinterest code in the live site, in the footer.php as you suggested, and it gave me this error code: “Unable to communicate back with site to check for fatal errors, so the PHP change was reverted. You will need to upload your PHP file change by some other means, such as by using SFTP.”

WHAT is that all about?!

This “widget” comes directly from Pinterest for their own feed. I have used this same widget/feed on older versions of my website, so why wouldn’t it work with yours, or why would it cause errors elsewhere?