Just thought I’d let people know that if you are developing on a local Windows PC (I use EasyPHP/MySQL server) – there seems to be a bug in Woocommerce where previously added product attributes and variations (for variable products) do not show on the back-end once you have published / updated. The front end website looks fine – but u cannot go back and edit previously added variations as they are not listed ('Expand All' does nothing). This drove me mad as I kept having to delete a product & re-add it whenever I wanted to e.g. change the price of the variation. This all works fine if you are developing on a host. Anyway have now had to change to developing straight on the hosted environment to avoid this bug. Dunno how many people prefer developing on local PC servers first – but just thought this may help someone!