Ironically, it wasn't that I was overreleasing something but rather that I was 
under releasing. 
Specifically, the fetchedResultsController's delegate was a view controller. 
The view controller owned the fetchedResultsController. Presumably a fairly 
common pattern.
However, the view controller's dealloc didn't release the 
fetchedResultsController, so when the data changed, it was still observing it 
and tried to the tell its delegate.

I'm a little surprised that the view controller was dealloced as it was still 
on the navigationController stack (one below the current view). Reading about 
the navigation controller now...

On 26/12/2009, at 01:29 , Kyle Sluder wrote:

> On Dec 25, 2009, at 12:48 AM, Brian Bruinewoud <br...@darknova.com> wrote:
> 
>> *** -[NSCFType controllerDidChangeContent:]: unrecognized selector sent to 
>> instance 0x3a11d70
> 
> Usually this is a sign of a memory management error, specifically an 
> overrelease. Run with zombies enabled to find it.
> 
> --Kyle Sluder

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