I was having trouble like that before uploading the Yorktown. I have added "_specular" and for view in low detail. See for yourself.
pLODModel.AddLOD(pStats["FilenameHigh"], 10, 200.0, 15.0, 15.0, 400, 900, "_glow", None, "_specular")
pLODModel.AddLOD(pStats["FilenameMed"], 10, 400.0, 15.0, 15.0, 400, 900, "_glow", None, "_specular")
pLODModel.AddLOD(pStats["FilenameLow"], 10, 800.0, 15.0, 30.0, 400, 900, "_glow", None, "_specular")