Any ideas on this?

Here's something strange.  It seems this script doesn't show any icon that 
depends on .question, .warning.  This is on qt-4.4.0.  Any ideas?

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

app = QApplication (sys.argv)
ret = QMessageBox.question (None, "My App", "You have mail")
print ret

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