OK, I\'ve just got myself a shiny new MacBook Pro, and having been developing my iPhone app on another MacBook, I wanted to migrate my development to my new computer.
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From this thread on ADC:
get-task-allow, when signed into an application, allows other processes (like the debugger) to attach to your app. Distribution profiles require that this value be turned off, while development profiles require this value to be turned on (otherwise Xcode would never be able to launch and attach to your app).