find my friends not working on IOS6

after updating my i phone 4s to ios6 my find my friends app is not working, i have a big chunk of map which is blurred out but its fine a few miles either way of the blurred chunk, also the notify me button is not accessable but it is there i just cant press on it i have deleted the app re installed, signed out and in again, etc etc etc but no joy can anybody advise me what to do please?