"Failed to check receipt hash" after switching to a new computer? I just had to move my drives over to another Mac Pro and now when I attempt to open apps purchased from the App Store, I'm getting Failed to check receipt hash.  What does one need to do in order to revalidate a machine properly for the App Store so that these errors go away?
I think you have to redownload those apps from the App Store in order to get new receipts that match your new Mac.