I have a typical problem with QT creator (1.2.1 based on QT4.5.2)

1) when i run my application using ctrl+r (free run), I crashes (unhandled expection)
2) when i run with using F5 (attaching a debugger) , it runs fine.

This is same for both debug and release build.

So as i can conclude
1) it is not a debug or release build issue, as usig F5 button , application runs fine in both build
2) it is a problem related to attaching the debugger to application , because using F5 button you are attaching the debugger to your application. while with Ctrl+r (free run ) you don't . and application only crashes in latter case.

Can somebody help to analyze how to solve it.