Thanks MadYuri, I started a thread (http://www.renderosity.com/messages.ez?Form.ShowMessage=905904) ages ago and thought that your duplicated polygons theory and gstorme's suggestion was pretty much the end of it. I guess I lost track of the thread and then saw paulifra's post this evening and have now printed out doldridg's suggestion. I shall try this new fix. Thanks to all. Gstorme, much appreciated. Rnce