>GetObjectContext returns Null if it cannot get the reference... it does not raise a runtime error. So, this behavior is expected if the object is not running under MTS. Have you installed the DLL under MTS?

Yes, I installed the DLL under MTS I even checked that when my method is executing the corresponding icon (a black sphere with a green X on it) in MTS is spinning. Is there any other circumstances by which GetObjectContext returns Null?

TIA

Luis