On this site http://www.fightergirls.com
Products which do not have options work fine.
http://www.fightergirls.com/shop/accessories/canvas-book-bag/
However any product which has variables or options doesn't show the Add to Cart button, even after a selection has been made.
http://www.fightergirls.com/shop/new-arrivals/established-grey-tank-top/
I've read that this can be caused if the product variations don't have prices assigned to them, but we do have prices for all variables.
Any suggestions? Thanks.