QLabel setPixmap only works twice?

I've been using this bit of code for ages, and it's always worked before, but since I upgraded to 4.6 it only works twice, then stops.

Code:

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label->setPixmap( QPixmap( dir + "/logo.png" ) );

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.. where dir is the path for a skin being loaded.

When I use it, the label gets a new graphic twice only (so I know for sure the path is correct), then stops updating. Is there some new features in 4.6 that would prevent this from working like it did in 4.5, or am I doing something stupid here?