See this post about the location:
http://www.iphonedevsdk.com/forum/ip...tml#post106575
You can clear out that applications folder, or in the simulator you can "Reset Contents And Settings..." which will do the same thing.
When pulling data out of NSUserDefaults like this, the result is not mutable - so NSArray vs. NSMutableArray - even if you put a mutable object into it. That could be related to the crash you are seeing, and something to keep in mind for elsewhere in your program when you are trying to do things with the array.
