Try this. Noli ~~~~~~~~~ def main(argv): app = QApplication(argv) QgsApplication.setPrefixPath("/usr/local/qgis1.6.0.app/Contents/MacOS/", True) QgsApplication.initQgis() wnd = MyWnd() wnd.move(100,100) wnd.show() retval = app.exec_() QgsApplication.exitQgis() sys.exit(retval) if __name__ == "__main__": main(sys.argv)