Woohoo! Just upgraded to 1.1.0 (which will forever be known as the "leprechaun edition") and was miraculously restored. I got a screen at login to select one of the social accounts to disconnect and then was back in business.
First, second, third and sixth: Did them all, I've got bubkus. Still no ability to login to GameCenter from the brotherhood screen. Fourth: You're not alone... it just takes a certain kind of suspension of disbelief to appreciate "Waterworld". Fifth: You're right. and Seventh: I'm really not a whiny bastard, I don't even…
Chiming in here with the same problem. I've lost all data after I tried to add my first "bro" this morning. No recovery despite seeing "welcome back" from GameCenter at startup. Please keep me advised.