I'm running ArcMap 10.3 and every time I export a dot density map it "slices" long, horizontal gashes in sections of the dots (see screenshot below). The cuts are never vertical, always horizontal, and it doesn't matter if I export as a PDF or image file like PNG or JPEG.
In the example screenshot, I have a dot density layer representing population data on top of a choropleth map showing demographic indices. The only other layers in my TOC are a shaded relief raster and a freeway/roads line layer.
Right now I'm simply manually exporting the map as a PNG at a resolution of 400 dpi, but the slices also show up at a lower resolution (such as 300 or 250). It's worth noting that the slices still show up even when I export the map using the
arcpy.mapping.ExportToPng tool in my script.
Wondering if anyone else has noticed this problem? Not sure if it's just an exporting bug or something else.