Hello,
i have updated versions to sip 4.9 and pyqt 4.6 and finally i have some time to make reproducible examples of the errors i posted to the mailing list some time ago, this code gives me on my machine (Arch Linux, qt 4.5.2, sip 4.9, pyqt 4.6 and python 2.6.3) this error when i push the button:

Traceback (most recent call last):
  File "error_emit.py", line 18, in testEmit
    self.emit(SIGNAL("cambiaFoto(QVariant, QVariant)"), QVariant(), QVariant())
TypeError: argument 0 of signal PyQtProxy.ambiaFoto(QVariant,QVariant) has an invalid type


---CODE----

# -*- coding: utf-8 -*-
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class TestPythonClass(object):
    def __init__(self):
        pass

class TestSubClass(QAbstractTableModel, TestPythonClass):
    def __init__(self, parent):
        super(TestSubClass, self).__init__()
        TestPythonClass.__init__(self)

        self.testEmit()

    def testEmit(self):
        self.emit(SIGNAL("cambiaFoto(QVariant, QVariant)"), QVariant(), 
QVariant())

class TestWidget(QWidget):
    def __init__(self, parent):
        super(TestWidget, self).__init__()
        self.model = TestSubClass(self)
self.connect(self.model, SIGNAL("cambiaFoto(QVariant, QVariant)"), self.printIsNull)

        self.button = QPushButton("test")
        self.connect(self.button, SIGNAL("clicked()"), self.model.testEmit)

        layout = QVBoxLayout()
        layout.addWidget(self.button)
        self.setLayout(layout)

    def printIsNull(self, one, two):
        print one.isNull()


def main():
    app = QApplication(sys.argv)

    widget = TestWidget(None)
    widget.show()
    return app.exec_()

if __name__ == "__main__":
    main()

---CODE----

Regards,
Miguel Angel.
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