I just finished another set of missions for Jetpack Joyride , but oddly I'm still missing one more star to be able to complete the set to level up. I have no new missions, so I guess I'm stuck. What do I do?
Quit the app, double tap home, hold on Jetpack Joyride, and delete it. (This will not delete the game itself; it just stops running it) and then open it again and see what happens.
Otherwise I'd say un-install and re-install; this shouldn't lose your progress if it is connected to something like Game Center.