Enfold - WooCommerce product variation buttons unresponsive

Enfold 4.2 installed. Most of the WooCommerce product variation buttons are unresponsive - press them and nothing happens. I have replaced the Theme with WooCommerce’s Storefront; the problem still exists, but Storefront’s variation selection has a “clear” button; If I set a default value, then the “clear” button will allow a selection to be made.