DAZ's store is having some sort of glitch (as far back as Friday). There are reports of multiple charges. So, if you try to make a purchase and it says it can't be completed, DO NOT follow the instructions and try again. Just file a ticket, maybe listing the items in your cart and any other information such as coupons or whatever. 

The only official word from DAZ I'm aware of was an email response to a forum member saying they are "working on it".