The viewports in a drawing do not always come through when viewing the dwf file. When you preview plot the view is there, but not when opening with the DWF viewer. Seems that when a polygonal view port is used, this is when this occurs. Can go back and create another view port and it might come through then, but not always. Version 2002 Autocad, DWF Plot with DWF Classic (R14 Look).pc3, viewing with DWF Viewer 6.