On 22 Jul 2014, at 1:37 am, Dragan Milić <mi...@mac.com> wrote:

> Does anyone know what could be causing this problem in such a way that it 
> doesn't happen to all, but only to some people? Is it possible to get the 
> graphics context completely screwed so that those messages start popping-up?


Attempting to draw from a thread other than main?

Using CALayer with a callback drawing method that doesn't properly establish 
the context?

Trying to force synchronous drawing on the main thread but not doing it right?

--Graham



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