QPrintDialog does not popsup if it is being shown via context menu.If i call QApplication::processEvents() before print-dialog.exec() it does shows the dialog but then it is unresponsive, canceling or doing any thing in dialog has no effect.
Attached is an example which can be used to re produce it.
Run the example and if you call print via Menu it works if you trigger print via context menu it does not, it may give a glimp of printdialog but thats it.
apply attached patch fixes it for OSX 10.8.2 but not for Snow leopard