title: Store Kit transaction failing
body: <p>I'm attempting to test a Store Kit transaction with the iPhone 3.0 SDK. I am basing my code off the sample code in the Store Kit Programming Guide, but I keep getting failed transactions (status: SKPaymentTransactionStateFailed). However, the transaction's error property is nil, so that doesn't shed any light on the situation. </p>
  
  <p>When I attempt to purchase the product, I am able to log-in with a test account and accept the purchase, but then I get a dialog box that says:</p>
  
  <p>"You've already purchased this but it hasn't been downloaded. Tap OK to download it now."</p>
  
  <p>When I tap "OK" nothing happens. My transactionObserver doesn't get any more messages sent to it. </p>