For a while now, I haven't been able to do "update all" on the Mac App Store because there's a stray purchase in there. For some reason it thinks that I bought Angry Birds from an account that isn't mine. I don't have Angry Birds installed, and I've never bought Angry Birds. I've also never used Mail.ru. I can't even buy and install Angry Birds and actually update it, because where I would usually purchase it I just get the reinstall dialog asking me to log into this email account that isn't mine. This isn't specific to 10.8, I've been having this issue since 10.7. Does anyone know how to get rid of this?