I'm experiencing this issue with the latest available release (2.1.2). The link to the bug report above states that this problem can be circumvented by specifying a resolution lower than 200 DPI. I tried 150 DPI, but the lines still appear, as shown below. The "Microsoft Print to PDF" option is not a feasible workaround for me because:
1) We need to print at high resolution. Based on the small file size created by this "printer", I'm guessing it's not a high resolution.
2) The CMYK color model that I've specified seems to be ignored when printing to the PDF
3) Custom sizes are a pain when using Microsoft Print to PDF. I found a hack for creating a custom page size here: Custom Page Sizes for Microsoft Print to PDF « Franklin Heath Ltd . But you have to go through those steps for every custom page size that you need.
I'm trying to adopt Pro, but I run into snags fairly frequently. This is another one.....