Like others have written, it has to-do with the display scale settings for the monitors being used on the individual's computer. Tech Support guided me through the solution and, while it's not elegant, it does allow me to produce PDF's which are accurate representations of the model.
I changed all my monitors to 100% scaling, closed X14 and re-opened the software. Printing to PDF now works (although, the buttons etc are very hard to see... definitely nothing to do with my aging eyesight!).