My app also just quit working beginning of this year. It does not update even thought settings have not been changed.
AFTER FURTHER RESEARCH IT DOES NOT WORK ON APPLE 7 which of course they do not tell you as you renew!
iOS 7 has changed the way Footprints tracks in the background. In iOS 7, when Footprints is killed by the user from the new App Switcher (by swiping up), Footprints will no longer track until it is manually launched again. This is different than iOS 6, where even if the app was killed from the app switcher it would have been automatically launched again.
Apple made this change to protect its users, so that any app that is killed by the user is no longer automatically relaunched. In the case of Footprints, however, kids can now easily disable background tracking by killing the app. We hope Apple reconsiders this new policy in future updates.p
Greg Johnson about Find My Kids ~ Footprints™