I've got a user using DocuCom PDF Driver 6.51 to (among other things) plot drawings from AutoCAD 2004 to PDF.  When he does so, everything works fine (including generating the PDF document) but the document just sits in the DocuCom PDF printer queue, then spits out a print error.  But, again, the PDF is created.  The problem is that he generates several PDFs an hour this way, and so they pile up in the print queue and cause instability.  Anyone have any experience with this or have a fix?  Thanks in advance.