On Apr 15, 2015, at 07:04 , Jonathan Taylor <jonathan.tay...@glasgow.ac.uk> 
wrote:
> 
> From dimly-remembered past experience I have a feeling it could be related to 
> something somewhere resulting in GUI code being executed on a non-main thread.

You can at least start by trying the simple things, if you haven’t tried them 
already:

— Make sure you have an Objc-C exception breakpoint set in Xcode at all times.

— Use the Console utility to look in the system log for errors about incorrect 
drawing calls in your app.

There’s not much chance this will get you off easily, but it’s a quick start.



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