I carefully checked the code and I believe I fixed most of crashing problems. I am really sorry for taking such a long time to release this update. And it would be helpful if you can write a comment or tweet me about the problem you hit.
It also includes some new enhancements.
1. Fedex and UPS tracking now has estimated delivery date and progress status. (Sorry, I could not find the estimated delivery date information from USPS API.)
2. Changed the way to specify the destination address. New version provides the list to pick the destinations you entered before.
3. Added a pin drop down animation for a little fun.