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Just a quick note, theres lots of information about NSZombie (NSZombieEnabled), heres the way to enable them:

1. Project -> Edit Active Executable

2. Goto the Arguments Tab

1. Set the Variable NSZombieEnabled and set it to YES (note: its Zombie, not Zombies!)

I’ll leave it as an exercise to find out more about NSZombie, its great for memory debugging.