The slot passed as argument to QMenu.addAction() is getting an incorrect
parameter (a boolean, always set as false). This snippet shows the problem:

from PySide import QtGui
app = QtGui.QApplication([])
fileMenu = QtGui.QMenu("&File")
def openFile(*args):
    print "args:", args
x = fileMenu.addAction("&Open...", openFile)
x.trigger()

It prints "args: (False,)" for shiboken, but should print "args: ()" instead.