Hi, (sorry for my english) Since I have select only the frosted ultra detail in my product inventory management for all my models and put a markup (about 10%) I can't put one of them in my cart. Everytime that I'm selecting buy, I'm redirected on the last web page I have opened or in the cart with "Your cart is empty" page. I tried to cancel the markup and put an other material but when I try to change that material to frosted ultra detail, the item is canceled of my cart. I'm on Firefox but I tried on IE and Chrome but the problem stay the same. I can buy items from other shops and change the material as I want without any trouble. I already bought some of my items but can't buy any thing with the new one even when I delete them.