Adding places from KML [Keyhole Markup Language] files

I think you must be referring to this posting? I haven’t tried any others in Gramps. Here are the contents of that KML file:

\<?xml version="1.0" encoding="UTF-8"?>
\<kml xmlns="http://www.opengis.net/kml/2.2">
  \<Document>
    \<name>farm\</name>
    \<Placemark>
      \<name>farm\</name>
      \<description>Brady farm\</description>
      \<Polygon>
        \<outerBoundaryIs>
          \<LinearRing>
            \<coordinates>
              -78.727697,44.299047,0
              -78.711711,44.302832,0
	      -78.709429,44.297504,0
	      -78.725496,44.293817,0
              -78.727697,44.299047,0
            \</coordinates>
          \</LinearRing>
        \</outerBoundaryIs>
      \</Polygon>
    \</Placemark>
  \</Document>
</kml>

I will have a look.