OK, this is driving me batty....
In 2019 C3D, I've got two sheets that I can publish to PDF, and they look on-screen as expected both in CAD and Acrobat.. If I try to print a hard-copy - Acrobat just spins and spins flatttening, and then craps out with a message that it can't print.
If I open the same DWG sheet files in 2021 C3D, I can plot a PDF and print it just fine, except that some of the hatch patterns that show on screen in CAD, are missing from the PDF.
I need to provide a printable Ansi D PDF for the client and contractors, but at this point none of my choices are acceptable.