I have two documents - one where the image set in the chart.xml for the marker is showing in the chart (markers_show.docx), and one where its just showing the "automatic" marker (markers_dont_show.docx). In both charts, the c:marker node for the "Aggressive Model No 2" series is under a c:dPt node and are identical. Also in both charts, the Marker Options shows the "Automatic" option checked rather than "Built-in" with the image type. Why is markers_show.docx rendering the marker with the image and markers_dont_show.docx not? Is there somewhere else in the ooxml that this is set?