I have AutoCAD 2006 and an HP Designjet 500. Every now and then some files don't print and HP and I pin pointed the problem a year ago to it being due to something with how AutoCAD handled its printing with certain file names and directories. In other words, if there are to many spaces or dashes or just a long directory path or name, it just fails to print. I made this awar to AutoDesk at the time, as did HP. Now I am just wondering when there will be a fix to this problem?