When we save a 2007 dwg file down to 2004. Then we try to open the file in either 2006, 2004 we get this, "ARX Error: eDuplicateKey". There was one suggestion is to load HPGLImport.arx within Acad2004 but this does not seem to work. We just upgraded to 2007 and if we can't save down to either 2006 or 2004, how can our clients work with our drawings? Looking for suggestions. Thank you.