I experienced a little weirdness with the flash sale, too. When I used a PSN card I also got the message that an error had occurred, although in my case it still added the funds to my account. Then I bought the games, but they weren't showing up in my download list on the webstore nor did it show that I had ever purchased them. It wouldn't let me add them to my cart again, either, and said something like, "You are not allowed to download or purchase this content." So I was just about to contact customer support, but when I checked the store on my Vita all my games were there!
So, I don't know. PSN is strange.







