I have Runkeeper installed and it works fine - except that when it's running I can't use any other phone functions i.e. the camera or make calls! The only way to get Runkeeper off the screen to allow access to other apps is to close it. I previously had RK installed on my HTC Desire and the 'back' button would minimise RK so I could see the normal home screen. Why can't I do that with my S4?