I run into 2 issues sometimes with PDF files and they happen in both the Traverse PC PDF driver and my Adobe PDF driver
1. sometimes the dash length of dashed lines is not reproduced exactly in the PDF file. I can usually fix this by selecting a different dashed linetype, like DASH-2X to get what I want.
2. a 0.00 line width is a special beast. It is suppose to use just one pixel in the Drawing View. As such, it doesn’t always reproduce well when exported to a PDF. I rarely use 0.00 in a final drawing.
So the two of these come together when I want to show adjacent lot lines (not surveyed) as thin dashed lines. If I am producing a PDF, I will usually opt for a color like Light Gray, a 0.01″ thickness and one of the dashed line types. This gives me the results I want.