Well setting to a label results in a crash in exactly the same place. Oddly, saving to a jpg file works fine (and not attempting to display onscreen). Its upside down, but that's is the only thing odd I see about the image.
I feel like there is something fundamental about what's wrong. Something I'm just not aware of in the Qt world. I don't think its threads, all the crashes and breakpoints show WinMain in the stack. But I have no idea what it could be.
Thanks for your help, anyway.
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