We created a new mxd file. We created a new layer using "Make a Feature Layer" command. Then we selected the new layer and got into the Symbology properties. There we created Quantities > Graduated Symbols for some database field.
The Symbology icons are visible in Arcmap:
We published the map as a MapServer.
The Symbology icons are visible in the published Legend of the Arcgis MapServer as seen here:
But the Symbology icons are not visible in the rendered map image of the MapServer:
Is there a special setting one needs to do in order to make the symbology icons visible in the exported map images of the MapServer?