On Mac OS X (only tested on 10.7.5 so far), this message shows up on startup:
OpenGL Program Validation results:
Validation Failed: Current draw framebuffer is invalid.
The message comes from GLView::initializeGL() in glview.cc:315
It somehow seems that the framebuffer hasn't been made available yet by the system. Need to investigate if this is related to Qt or a recent Mac OS X version, or if we've just been lucky so far.
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This looks like a Qt bug: https://bugreports.qt.io/browse/QTBUG-36802
Not sure when it will arrive in Qt - perhaps 5.4.1 ?