I am using ArcMap 10.5.1.
I am making a series of maps though not using DD Pages. On one of my maps, when I export a thin blue line, whose color matches my ocean background, appears running horizontal at an angle across my map. It is quite unsightly and I need to submit my final draft to my client by next week.
I saw an earlier thread suggesting to adjust printer properties and another suggesting to remove rotation on symbols. I have tried all of these options to no avail.
I also tried exporting to various formats, including JPEG and PDF, with same result.
I would be grateful if somebody out there can let me know how to remedy this situation. See screenshot.