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Maps containing line symbology, usually thicker lines, may display incorrectly when printed or exported. These anomalies may appear as gaps, chunks, and/or cut-outs missing along arcs or lines.
In the example below, the image on the left shows a thick dashed line symbol as seen on-screen in ArcMap. The image to the right shows chunks missing (highlighted in the red boxes) when displayed as an exported PDF file.
This is a known issue with thick line symbols that become rasterized on output. This anomaly occurs when the layer symbolized by the thick line symbol is:
Remove the transparency or picture line symbology from the line layer, or reorder the line layer so that it is above all other raster layers and layers symbolized with transparency or picture symbology.
Please note:It is highly recommended to use ArcGIS Pro for printing and exporting, especially when experiencing issues caused by the limitations of the ArcMap display engine. More specifically, ArcGIS Pro is not restricted by the graphical device interface (GDI) limitations that some users experience in ArcMap. For example, transparency is natively supported in ArcGIS Pro, preventing the rasterization of layers. Additionally, ArcGIS Pro supports transparency in layout elements.
Note: ArcGIS Pro does not support exporting Adobe Illustrator files; it is recommended to export using PDF or SVG instead. Also, because ArcGIS Pro does not use the Windows GDI, font substitution or fallback does not occur in ArcGIS Pro. Boxes may appear if using characters unsupported by the chosen font.