Whenever I convert DWGs to PDFs through Trueview (tried 2009, 2012, and 2013), the PDFs become nearly impossible to print. I am not retaining the layers in the PDF, but when anyone tries to print the PDF to a printer, it gets stuck for quite some time with "Flattening" being shown in a message window (using Adobe Acrobat).
Is there any way to convert DWGs to PDFs, and not have them 'flatten' when printing? If I plot straight to PDFs from Autocad, I don't have this problem.
You are crerating PDFs with 'layers', and since printing is a 'flat' process, you are forcing the PDF reader to do that for you.
DWG Layers is one culprit, using an AutoCAD PC3 file or driver with 'line merge' turned on will do this too. I believe certain hatch options like transparencies do this as well. So find out what you do in AutoCAD and set it up exactly in DTV to do the same.
Or find and use a free PDF driver: most are no sofisticated enough to generate layering in PDF files.