The first beta has been very unstable for me, so I'd really like to get my hands on beta 2, but I'm getting the "code already redeemed" error. What's worse is that the update doesn't show up in the Updates tab nor does it show up in the Purchases tab. The download never started, the connection was never interrupted. I never even saw it. I just immediately got the "code already redeemed" error the very first time I logged into the developer site and clicked the download link. No one else has access to my account. There's no good explanation for why this is happening.
If anyone has a more effective solution to this besides repeating "Look in the Purchases tab", I'd be happy to hear it. I've tried refreshing and quitting and signing out and signing back into the App Store many times by now. No luck.