Dear Katie,
I checked my preferences and the Quartz imaging was not enabled - so was not operational when I was trying to print. I also looked at the same drawing on the Preview for my very new laser printer - Xerox Phaser 6120 and it also displayed the same problem.
(FWIW When I used the print to .pdf function I used the print to .pdf function in the OS).
After reading your email I went back to VW and 'checked' the Quartz box in the list of Preferences thus enabling it: the problem seems to be resolved on the drawings I have now printed. So many thanks.
Excuse my ignorance but what is Quartz printing and why was it now necessary to enable it in this version? I've just checked the VW12 that I have not upgraded and it is not enabled' there - and all the printing worked for months.... Francesca