Me too. I find that if I go in with another account that I made up that is "family" to the main account, the buy download/buy button is green and you can press them but it comes up with not attached to the main xbox account. Having said that, I have noticed that since I ticked the add to favourites box I have had my account attacked from Germany, Indonesia, 4 places in America and of course Russia so it may be that you and others have had that account switched off for Marketplace yet can download from the app store. Just a thought as I have been trying to get around this problem since last Wednesday.