Distiller arbitrarily ignores compatibility setting

Question

Here's the scenario: Two people sitting next to each other with the exact same setups (WinXP, Adobe TCS with FrameMaker 8 and Acrobat 3D).
Person A (me) makes a PDF from FrameMaker using the established standards (including to set compatibility with Acrobat 5.x/PDF 1.4). Everything works just fine.
Person B, who is using a fresh install of Windows and TCS, makes a PDF from the same FrameMaker files, using the same settings (same .joboptions), and everything APPEARS to be the same. However, the in-house print shop (which uses something called "Preps 5.2") cannot print from Person B's PDF. The job fails and gives no error messages.
Examination of the PDF properties shows that Person B's PDF is compatible with Acrobat 7.x/PDF 1.6. Huh? So I sit with Person B and watch her make a PDF. She chooses the correct job options, makes the PDF, and bingo, same problem; it ups the compatibility to 7.x/1.6 in the final result.
Aside from any silly reasons why the print shop apparently can't handle Acrobat 7.x/PDF 1.6, why is her Distiller ignoring her PDF settings?
More importantly, how can we fix this?
Thanks!
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Answer 1

Hmmm. It turns out to be pilot error of some sort on the part of Person B. I sent her my .joboptions file, which she used instead of the one she created according to the same criteria, and now it works OK.