i'm not sure if this is the problem or not and its just a suggestion or what i think could be the problem. i recently got into the whole application duping and recently got UDID Faker it took me a couple tries to get it down but i got it to work only to find out it wouldn't work for me because my duplicated castle age would still load my iPod's iTunes original account, it's not the same for Facebook accounts however. Now onto the problem.. in the process of learning how to dupe correctly (Castle Age HD was the app obviously) i noticed a string of code that had my email that was attached to my iTunes account in it also my current credit balance on the account oddly.. but i cannot remember how or where i seen this (Sorry!) but i'm assuming CA now tags or flags the app with the current active iTunes account on the device so no matter if you have UDID Faker it still loads up and recognizes only the active iTunes account for iPhone account users, not Facebook. if that is the problem then i guess a iTunes account faker would need to be made? if one doesn't currently exist i have never looked, either that or simply modifying your app or duped apps file to change the email. Maybe someone is willing to look into this.