We noticed a couple issues that had crept into the submitted build, namely:

1. A bug that when secure radio box was checked the App exited.
2. A registration bug.

We have submitted an update to the Windows Phone 7 Hub but until then we recommend:

1. Do not check the secure radio box. If you have and you have auto-login "on" then you'll need to remove the App and re-install from the Windows Phone 7 MarketPlace.

2. Register via for an account

We will update here when the revised build is certified and available.