Having problems here also. Trying to rent movies through AppleTV from iTunes but I get an error message saying that there is a problem with the iTunes store. Trailers play fine, but can't rent movies.
happened to me sunday. said my account was disabled and they cleared the remaining gift card balance of $2.99. that's what i get for buying gift cards from eBay at half price. anyhow, got it re-enabled via live chat the next day.
Toggle from cart to 1 touch, quit itunes, restart itunes, reset your pref. Worked for me... Seems to be affecting lots of people tonight tho in their support forums...