I have installed version 1.0.11 of Shoppica together with version 1.5.1.3 of OC. I think there is a redirect bug when checking out with a gift voucher. I cant go any further from the cart when a gift voucher only is in the cart. Every other product works just fine, but not with the gift vouchers. It just sends me back to the cart when I press the checkout button. If I add another product to the cart together with the gift voucher, then I can check out. But I cant checkout with just the gift voucer. Any ideas? I get no error messages either and there is no error messages in the OC log.