Today (October 6), after testing the apps in a variety of situations, including a beta test, we released updated versions of Todo and Todo Cloud on the app store. As soon as the update became available, we realized there was a serious problem in that the updated app failed to load. This problem had not manifested itself in any of our testing.
We immediately pulled the app from the store, and started the troubleshooting process. We are confident that we have found the problem, and are re-submitting the app. We expect that Apple will update it quickly.
For those of you who updated the app, we apologize for the inconvenience, and hope the have a working update for you soon.