Custom tax field

Store URL: http://www.cateringplock.pl/zamow-catering
WordPress version: 3.5
WP e-Commerce version: 3.8.9.5.
Gold Cart version: ?
Theme: Photolux

Problem: Where’s custom tax field ? Disappeared ? It used to be on the product edition page…

http://wordpress.org/extend/plugins/wp-e-commerce/