You can clone with
HTTPS or Subversion.
When I try to update an order, I get this in my PHP error log:
PHP Fatal error: Call to a member function exists() on a non-object in /var/www/mysite.com/wp-content/plugins/woocommerce/classes/class-wc-order.php on line 1079
I think it has to do with the fact that the products ordered are set as backordered.
Closed via f992474 will be released in v2.0.15.