Variable prices disappear after update

Just updated to WP 4.4 and the latest Woo Commerce version 2.4.12. Prices have disappeared from variable product pages but appear in ‘cart’ ok. Updating a variable product clears the problem.

I can rectify this problem product by product but with a large number of products this is a daunting task. Is there a way to ‘Update All’?

I have moved theme to Twenty Sixteen and also deactivated all plugins except Woo Commerce but this doesn’t clear the problem.

example product at:
http://www.hdfhs.org.uk/product/drighlington-st-paul-baptisms/

https://wordpress.org/plugins/woocommerce/