I am not sure what happened or how I did it but for no reason that I understand I am unable to see my drawings. It is as though there is a black screen over the model window. I can see my cursur until I put it over the drawing portion of the window. i.e. I can see the cursur over the command portion of the window. For whatever reason this command has been applied to the entire program so I am unable to see any of my drawings. The last command I saw before this happened was "Properties window palette closed", but I don't know what it means. Can anyone help?