Differences between drawing as displayed and as printed?

[BTaylor_MEI]

I'm having an issue with my drawings in Creo 9.

In the UI I'm able to get the drawing to look the way I want it to, with no hidden lines;

However, when I print, one element of my assembly (and only this one) prints out with hidden lines shown:

When I return to the Creo window after doing a quick export to .pdf format for printing, the troublesome element has bolded purple lines, which I assume is a clue to what's going on here, but I don't know what that means.

Any idea what I've done here and how to correct it?

Thanks!

   

[kdirth · Accepted solution]

Purple usually indicates a surface feature.  The change in the view after a PDF export is unusual.  Are you using the menus to create the PDF or using a mapkey that may be performing other operations?

[BTaylor_MEI]

Thanks for pointing me in the right direction! Somehow I must have created a quilt out of the surface of the part; when I suppressed that it in the model tree it disappeared completely, which is not what I had expected it to do, but now the drawing renders as expected.