Nike+ Running App on the iPhone 4 (problem)?

I have a Nike account and I signed in all right. I got to the screen that says "Run Setup" and I set it up as a Basic run with no music and no 'cheers'. But when I tap Begin Run nothing happens. The screen just stays as it was before and no matter how many times I press the button nothing will happen.
For any clarification, I'm using an iPhone 4.

You should try uninstalling and reinstalling the app, that should work.

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