This reminds me of how upset I was to break my Battlefront CD when I was younger. One of those games you had to enter the CD for to start. Needless to say, that was what started my torrent and crack experience.
Such a great game. The mods and third party maps were awesome. No edition after the first ever lived up to that, especially this new crap they came out with.
PayPal is notorious for displaying meaningless errors for just about everything, even when it is intentional. Might not be the case here, but they definitely do things like this.
Though if I had to put my money on it, if it isn’t a bug it’s an anti fraud measure of some sort.