We use symbols created in Layout and saved to Scrapbook for all our annotation. Everything looks fine in Layout, and when exported to pdf it looks fine when viewed with the system viewer. The pdfs print fine here at the office at 11x17, but when we send to the print shop for full size prints (ANSI D), some of the annotation objects have different lineweights. Here’s a scan of the full size print showing the discrepancy: Scan.pdf (1.4 MB)
Mat
I cannot replicate what is happening with your print shop.
All the line weights remain as I (you) see them in the LO file.
All I can suggest is to ask the print shop if they are manipulating the .pdf file prior to printing. (saving as .tff or other?)
Or…try another print shop.