This question was brought up last month and there hasn't been a fix reported yet. I replied to that thread with hopes of a solution but nothing yet. Trying my luck as a fresh post.
I have a pointfile I wish to display as pie charts. When I try to export the map (A single polygon shapefile and the pointfile), image file is correct, i.e., all data points/pie charts write to the image file. But when I add multiple shapefiles (a continent border, country borders, and a third polygon layer) converting the map drops pie charts above two unique values. I've been able to determine the problem is linked to the placement of layers. If I place the pie charts below a hollow polygon layer, and proceed to export the image, the export process fails to draw polygons with >3 values. I want to display a hollow borders layer on top of the pie charts. Converting features to graphics places pie charts on top of political boundaries.
My temporary and insufficient rescue:
Screenshot the image, paste into Paint. Edit out the dotted guide lines, select desired whitespace around map and export as PNG. This is not a fix.