It's fairly uncommon; it seems that it's one file somewhere in the entire CDN. They're working at updating the entire CDN cache, but a small percentage of users--which, when you're talking about 1.1 million copies of a game is still a large absolute number--have gotten a bad download. Apparently, they have a fix now and you will not need to redownload the entire game, but rather just a few files from it.
Unfortunatly i had already deleted the entire game and started the download of the GOG backup verison instead :( - lol.
Luckily i have 40dl/10ul fibreopic broadband so i'm 75% done already.
You are not alone on this one. LUckily it's already merging game files xD