There are at least four email address AppleID's (I have found in links across the forums) users are being asked to somehow sign into, for which the users have never used!
Mostly the Update in question is for this "Twitter Inc." app which most of the users concerned HAVE NEVER USED OR OWNED!:
lukemulholland@me.com
tr33st@live.com
tr33.heine@googlemail.com
nicefright@gmx.de
Over a week old this issue is!
Additionally, apps **I DO** actually have on my machine in the latest version (like Aperture 3.x.x) are STILL not showing ever as "Installed" in the MAS!
Just ridiculous, I have apps I'd like to download and use form the MAS, but until this issue is resolved I simply do not trust the whole system is secure enough!
APPLE SHOULD BLOODY BE FIXING THIS! (sent them complaints with links to this forum & all the other ones, yet here we still are!)