Mac App Store Receipts and Mavericks
Craig Hockenberry describes more problems developing on Mavericks:
After decrypting and checking the receipt payload, the value was “3.6.2b1” not the version I just installed. Where did this old version number come from? Why did following the advice in the dialog and deleting the app not fix the problem. How come this old receipt kept showing up no matter what I did?