On 14 Nov 2012, at 22:10, Graham Cox <graham....@bigpond.com> wrote:

> 
> On 15/11/2012, at 8:59 AM, Nick Zitzmann <n...@chronosnet.com> wrote:
> 
>> Oh. I understand how that could happen with GC if the app tried to re-use a 
>> finalized object, but the only resurrections I've seen happen under RR or 
>> ARC were zombies… Sorry.
> 
> 
> Well, the crash is actually from libdispatch, so who knows what it's using?
> 
> Our app actually only makes fairly light use of threads, and does not do any 
> communication over the network, etc, except as might be done behind the 
> scenes by standard classes. Apparently this occurred when cancelling a 
> document save, though it might have nothing directly to do with that. At the 
> time of the crash, NSToolbar was doing something on the main thread...
> 
> That's the problem with this - even if I fully understood what it meant (I 
> don't) then it's not clear that the issue is in any way fixable in our app's 
> code.

I believe the Versions system uses XPC internally. Does your app support 
Versions?


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