On Dec 24, 2009, at 10:05 AM, Raphael Sebbe wrote:

> I got that random crash in some apps too, and I can confirm the Guard Malloc 
> behavior. The workaround for me was to delay the setup of the QCLayer to some 
> time after the window is on screen, instead of having it in the awakeFromNib 
> / or similar. (but I don't think it solves everything)

Very interesting. I was also trying to defer the setup of the 
QCCompositionLayer until later when I read your message. In my case I am still 
seeing the crash even if I defer the construction of the QCCompositionLayer. I 
will keep experimenting but this seems like it is almost definitely an OS bug.

I will have to make an example project and file a RADAR bug.

Thanks. _______________________________________________
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