Try re-downloading Qt. I recall this bug. Upon releasing, the Trolls accidentally uploaded a wrong version of Qt (having the QImage bug) to their servers. It was soon later fixed to the correct package, but all users who managed to download the package during that time were affected by the bug. Are you even able to launch Qt Assistant and Designer? As far as I remember, the bug even prevented either one or both of them from starting up.
EDIT: By the way, I'm 100% sure the bug was listed on the Task Tracker. I can't find it anymore, though...
It's QImage's constructor. Not his own code. d is a pointer to the private implementation.
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