After update to 2.1 option not available

After updating hikashop some options which previously worked no longer do. i can select options on the product page but when i go to check out it comes up that none of the option products are available.

on the link below if you select some tier flavours and then proceed to checkout you will see what i mean

66.147.244.93/~therebe5/joomla1/gk_resta.../category_pathway-15

Your options don't have a price.
You must have the "display add to cart button for free products" option turned off in the configuration.
Previously, even when that option was off, you could still add free options. That is now fixed. So you need to set that option properly on your end and it will work again.

Perfect. That sorted it.

Thanks