The latest update 2.9 is crashing for iOS 4 users. We have zeroed in on the problem, and should have a fix ready very soon. If you are still running iOS 4, you will want to hold off on updating your app for the time being. Alternatively, if possible, it would be best for you to upgrade to iOS 5.
I must apologize for this issue -- and hope to get it resolved ASAP.
- Tan Thor Jen