On 05/09/2013, at 12:21 PM, Jonathan Taylor <jonathan.tay...@glasgow.ac.uk> 
wrote:

> Searching for those terms finds suggestions that this may be associated with 
> updating progress bars from a secondary thread. I still see the error even 
> after removing the only progress bar from my program; I don't know whether 
> the cause is something genuinely associated with progress bars, or whether 
> it's just that it's easy to slip up and update them from a secondary thread, 
> triggering this error.


You can't do any UI-related updates from a secondary thread, you must ask the 
main thread to do it.

It might not be progress bars but anything at all that's being drawn from a 
secondary thread. The error itself could indicate that an internal data 
structure was used or updated by another thread while in an inconsistent state.

--Graham


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