The first time that I attempt to print to a PDF using Adobe Acrobat Standard X in Hydraflow Hydrographs 2009 (part of the AutoDesk Civil 3D suite), I get the attached error "Run-time error '5': Invalid procedure call or argument" and then they program crashes, but the PDF is created. The issue doesn't appear to happen again until I restart my Windows 7 x64 workstation & try it again. After the first crash, it doesn't seem to reoccur.
This also doesn't seem to occur whenever I print to another print device, or to PDF995. I've ran all Adobe Acrobat updates & have applied all the appropriate Autodesk patches, but still no luck.