I rebooted my phone the other day (HTC Hero) to update apps and Sprint Navigation is now gone. I have not rooted it or any of that other customization stuff. The shortcut icon was gone from the screen, replaced by a generic icon and a message of "this application cannot be found" or something to that effect when I pressed on it. It's totally gone from the Application list/menu as well. Any thoughts on what I can do? Can I just drop by a Sprint store and get it restored?