WooCommerce was updated to version 2.6.10, from version 2.6.9. Changelog:

• Fix flat rate no class costs when no shipping classes exist.
• Fix returned REST API coupon expiry date.
• Fix reviews_allowed being set to false in Rest API.
• Fix sales date series for some custom ranges.
• Fix missing attributes when an option is chosen by default on variations. This was the result of a Firefox 50 compatibility fix. In order to support both Firefox, Chrome, IE, and Edge we’ve done some refactoring of the variation add to cart scripts.
• Updated Geo IP API services.
• Added support for WP VIP/VIP GO GEO IP headers.
• Dev – API – Throw error messages when product image ID is not a valid WordPress attachment ID.