I downloaded the first episode last night, and played through it just fine. Went to purchase the second episode and it says "Appstore error, unable to purchase episode." I tried several times last night and over the course of the day, and that's the immediate error I get.
My iTunes account 1. has credit; 2. is linked to a valid credit card; 3. I can purchase other music/apps just fine. Its honestly is happening immediately after pressing the Purchase button, and it's not prompting me for my account info or anything like that. I have tried connected to my home wifi and via 3G.
Restarting the game and/or the phone doesn't help. I have an iPhone 4 running iOS 5.0.1. Thoughts?