Warning: Missing argument

Hi Duncan,

You have this in you child theme functions.php file:

/*
	Woocommerce 3.0.0 Compatibility Fix
	Remove Enfold's custom functions that conflict with the new image display in WooCommerce 3.0.0
*/
global $woocommerce;
if( version_compare( $woocommerce->version, '3.0.0', ">=" ) ) {
	function avia_woocommerce_gallery_thumbnail_description($img, $attachment_id, $post_id, $image_class ) {
	    return $img;
	}
	function avia_woocommerce_post_thumbnail_description($img, $post_id){
	    return $img;
	}
}

Could you try to remove that to see if it helps?

Best regards,
Rikard