PyQt connect works on Windows but not on Linux

[Superbebert]

Hi,

I have a small problem with PyQt. I coded connect which works well under windows but not on linux. I use qtDesigner to generate design.
This is main parts of my soft:
IHM.py file:
@
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(952, 778)
MainWindow.setProperty("accessibleName", _fromUtf8(""))
[...]
self.action_Quitter = QtGui.QAction(MainWindow)
self.action_Quitter.setCheckable(False)
self.action_Quitter.setObjectName(_fromUtf8("action_Quitter"))
@

this main.py file
@
class GDOC(QtGui.QMainWindow,Ui_MainWindow):
"""Main Qt Window"""

    def __init__(self,Form):
        print "GDOC:init Initialisation Application"
        self.config=config_file()
        #self.config.print_conf()
        self.Form=Form
        dbname=self.config.get_config_elem("ref_db")
        self.dbref=db_manag(Form,dbname)
        #self.config.add_elem("ref_db",str(dbFileInfo))

    def setupUi2(self,Form):
        """Ajoutons ce qu'il manque à la fenêtre"""
        self.Form=Form
        Ui_MainWindow.setupUi(self, Form)
        # A conserver pour rediriger l'exit de la croix vers le close_event
        Form.closeEvent = self.close_event

        QObject.connect(self.action_Quitter,SIGNAL("triggered()"),self.test)
   
    def test(self):
        print "coucou"
    [...]

if name == "main":
app = QtGui.QApplication(sys.argv)
MainWindow = QtGui.QMainWindow()
ui = GDOC(MainWindow)
ui.setupUi2(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
@

So, window is well displayed on both versions (Linux and windows), but test function is never executed under Linux and there is not error messages.
Add Info:
Linux: Python User Interface Compiler 4.9.1 for Qt version 4.8.1
Windows: Python User Interface Compiler 4.9.5 for Qt version 4.8.3
and code generated by pyuic4 is the same between Windows and Linux version.
If somebody can help.
Many Thanks
Superbebert