On Tue, 10 Mar 2015 18:25:23 +0000, Quincey Morris said:

>If something else is using a conflicting ‘removeObserver:forKeyPath:’,
>it might sorta work if all observers use it (because the total number of
>removals is equal to the number of observations, even if they remove
>each others’ observations), but fail if some try use
>‘removeObserver:forKeyPath:context:’ on an observation that’s already
>been removed.

It must be something like that.  I've gutted my app down to test case size and 
it still reproduces. :(  If you're curious I can put it online.

>Also, a long time ago (Leopard-ish), there was a horrible bug where
>observations of (from?) the same thing could get mixed up so that
>attempting to remove one would actually remove the other. I doubt this
>was ever fixed — it was subtle.

The Foundation Release Notes speak of similar things being fixed... but maybe 
there is another bug...

Cheers,

-- 
____________________________________________________________
Sean McBride, B. Eng                 s...@rogue-research.com
Rogue Research                        www.rogue-research.com 
Mac Software Developer              Montréal, Québec, Canada

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