Some users have reported a “Could not authenticate you” error after upgrading to iOS 5. Apparently the Twitter OAuth token which we store in Apple’s secure iOS keychain is not migrating properly to iOS 5.
To fix this problem, follow these steps:
Tweetlogix will automatically detect that your account exists and will re-authenticate the existing account. You will need to repeat this for each of your accounts.
Sorry about this inconvenience. I’ll be looking more into the cause of the problem.