I'll give this another visibility bump, as a confirmation email recently helped me out a bit. A lot.
I had a game go missing from my GOG library, where I'd seen it not two days before. More troubling, I had it missing from my order history, too. The game had been a gift, and not surprisingly, my PM history with the generous chap had also gone missing. Most troubling, the game was Sacrifice, and I was in fear for my life because Licurg. Also, I was missing out on a good bundle. That email confirmation was my only - dubious - claim to sanity. As you can tell, I'm still alive, mostly sane, and made whole once more, praise the Firek. Still, I dare not think what eldritch horrors might have befallen me had the confirmation email not been.