Hi Roy, I am receiving a fatal error each time I tried to render a particular model. I was rendering a view everything was OK, I change the view, tried to render and I received the fatal error advise. I restart windows open the drawing, tried to render the view again same results. I shut down my system again, open autocad open the drawing using recover (no errors), copy all the objects to a new drawing, tried to render, always the fatal error. I tried to render the original view when everything was ok, same fatal error. I am using Windows 7 Ultimate 64 bits, autocad 2011 and NXt 237. Do you need the model?
Alejandro