I would try deleting the app, then go back to the App Store and reinstall it. The best way to do this is to go to the "update" tab, then tap "purchased," and then tap "not on this iPod." Find the game, then tap the little cloud icon.
If this doesn't help, try contacting the developer and let them now about it.
Ever since I deleted my saved game to start over, the game crashes just before the first job of the tutorial... At the screen where one chooses which soldiers to include... I've emailed RodeoGames and will post whatever answers I get.