Crash when adding persistent store (iCloud enabled) in app delegate

Question

I am going to start updating this to help those seeking to use this as reference for their own personal code.

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Answer 1

Another clarification: A similar situation happened to me testing devices on iOS 6.0.1 and the 6.1 beta 2.

It is not completely fixed in iOS 5.1 as stated by @Slev. One device would completely freeze for roughly 80 seconds while trying to access the persistent store on iCloud but would never actually access the information stored there.

I believe this is due to a corrupted log file in the device's OS. Deleting the app or iCloud data on the device did nothing to fix the freeze/inability to access the iCloud store.

The one fix I found was to reset all settings (erase all content works too) on the device. settings->general->reset.

Only then could I access the data on iCloud with my app on that device again. I hope this helps anyone else that came here looking for a solution to a very frustrating bug.