Unity iOS Crashes Every Other Launch

When I first launch my Unity iOS app, everything is fine. If I hit the home button and then tap the app again, it crashes; tapping again launches normally. I did notice that UnityCleanup() gives an EXC_BAD_ACCESS error in XCode, but I'm not sure what the definite problem is. I am using Unity 3.3 and XCode 4.2 on Snow Leopard.