I'm having trouble getting the leaderboards to show up in my game, short of my initial login, i have no idea if gamecenter is cooperating with my code. I prompt the leaderboards using a touch detect on some text, ala... and... Which then triggers... The app simply crashes. It seems as though the app crashes when executing "presentModalViewController", which looks like a function of UIKit? The apple provided GKTapper code doesn't shed any light on how to properly implement this into a CCLayer. Can anyone help? Or is there an existing example other than GKTapper?