Our new release 1.60 contained lots of great stuff, but some users on iOS 4.2.1 (and the Verizon-specific versions of that OS) experienced a problem that prevented the app from starting.
With the help of our users we have been able to resolve the issue, and Apple have kindly agreed to rush-release the new version containing the fix. If you experience a problem, be sure to update from the App Store.
NOTE: This update also adds the ability to disable the warning message that appears when you add more than 100 contacts to a group, so if your mail provider does not have that limitation, you can now disable the message from the Settings app on your device.
Soluble Apps 