Find My Friends Not Working Properly after iOS 7 Update

Following update to iOS7, the Find My Friends app doesn't seem to work properly anymore. In particular, when the app is on, or running in the background (i.e. you can see it when you double tap the home button) everything is fine and my friends can see my location. When the app is killed, i.e. off or not running in the background, then my friends cannot see where I am.

That was not the case with the old iOS where regardless of the app running in background or not, my friends could still see my location. Has this happened to anyone? Does anyone have a solution?

Thank you!