Sure Pete.
The first <Placemark> is working but other 2 <Placemark>s who use
<Ploygon> are not working.
Same kml file is working on 1.3 version.
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="
http://www.opengis.net/kml/2.2" xmlns:gx="http://
www.google.com/kml/ext/2.2" xmlns:kml="
http://www.opengis.net/kml/2.2"
xmlns:atom="
http://www.w3.org/2005/Atom">
<Document>
<name>~GE1E1.kmz</name>
<Style id="sn_ylw-pushpin0">
<IconStyle>
<scale>1.1</scale>
<Icon>
<href>
http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</
href>
</Icon>
<hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
</IconStyle>
<LineStyle>
<color>ff00aa00</color>
</LineStyle>
<PolyStyle>
<color>ff00aa00</color>
</PolyStyle>
</Style>
<StyleMap id="m_ylw-pushpin0">
<Pair>
<key>normal</key>
<styleUrl>#s_ylw-pushpin0</styleUrl>
</Pair>
<Pair>
<key>highlight</key>
<styleUrl>#s_ylw-pushpin_hl0</styleUrl>
</Pair>
</StyleMap>
<Style id="sh_ylw-pushpin">
<IconStyle>
<scale>1.3</scale>
<Icon>
<href>
http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</
href>
</Icon>
<hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
</IconStyle>
<LineStyle>
<color>ff00aa00</color>
</LineStyle>
<PolyStyle>
<color>ff00aa00</color>
</PolyStyle>
</Style>
<Style id="sh_ylw-pushpin0">
<IconStyle>
<scale>1.3</scale>
<Icon>
<href>
http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</
href>
</Icon>
<hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
</IconStyle>
<LineStyle>
<color>ff00aa00</color>
</LineStyle>
<PolyStyle>
<color>ff00aa00</color>
</PolyStyle>
</Style>
<Style id="s_ylw-pushpin_hl0">
<IconStyle>
<scale>1.3</scale>
<Icon>
<href>
http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</
href>
</Icon>
<hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
</IconStyle>
<LineStyle>
<color>ff00aa00</color>
</LineStyle>
<PolyStyle>
<color>ff00aa00</color>
</PolyStyle>
</Style>
<StyleMap id="msn_ylw-pushpin0">
<Pair>
<key>normal</key>
<styleUrl>#sn_ylw-pushpin</styleUrl>
</Pair>
<Pair>
<key>highlight</key>
<styleUrl>#sh_ylw-pushpin</styleUrl>
</Pair>
</StyleMap>
<Style id="s_ylw-pushpin0">
<IconStyle>
<scale>1.1</scale>
<Icon>
<href>
http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</
href>
</Icon>
<hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
</IconStyle>
<LineStyle>
<color>ff00aa00</color>
</LineStyle>
<PolyStyle>
<color>ff00aa00</color>
</PolyStyle>
</Style>
<Style id="sn_ylw-pushpin">
<IconStyle>
<scale>1.1</scale>
<Icon>
<href>
http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</
href>
</Icon>
<hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
</IconStyle>
<LineStyle>
<color>ff00aa00</color>
</LineStyle>
<PolyStyle>
<color>ff00aa00</color>
</PolyStyle>
</Style>
<StyleMap id="msn_ylw-pushpin">
<Pair>
<key>normal</key>
<styleUrl>#sn_ylw-pushpin0</styleUrl>
</Pair>
<Pair>
<key>highlight</key>
<styleUrl>#sh_ylw-pushpin0</styleUrl>
</Pair>
</StyleMap>
<Folder>
<name>Boston</name>
<Placemark>
<name>82 Devonshire Street, Boston MA 02109</name>
<description>Attached to the ground. Intelligently places
itself at the
height of the underlying terrain.</description>
<Point>
<coordinates>-71.05720146107079,42.35768477715064</
coordinates>
</Point>
</Placemark>
<Placemark>
<name> New Polygon</name>
<TimeSpan>
<begin>2010-12-20T03:00:00Z</begin>
<end>2010-12-21T02:59:59Z</end>
</TimeSpan>
<description>This is a new polygon.</description>
<Polygon>
<altitudeMode>absolute</altitudeMode>
<outerBoundaryIs> <LinearRing>
<coordinates>
135.2, 35.4, 0.
135.4, 35.6, 10000.
135.2, 35.6, 5000.
135.2, 35.4, 0.
</coordinates>
</LinearRing> </outerBoundaryIs> </Polygon>
<Style>
<PolyStyle>
<color>#a00000ff</color>
<outline>0</outline>
</PolyStyle>
<BalloonStyle>
<bgColor>00664422</bgColor> <textColor>fffffff</textColor>
<text><![CDATA[ $[name] <HR> $[description] <BR>
<A HREF="
http://www-step.kugi.kyoto-u.ac.jp/">SPEL Home page</A>
]]> </text>
</BalloonStyle>
</Style>
</Placemark>
<Placemark>
<name>82 Devonshire Street, Boston MA 02109</name>
<styleUrl>#msn_ylw-pushpin0</styleUrl>
<Polygon>
<tessellate>1</tessellate>
<outerBoundaryIs>
<LinearRing>
<coordinates>
-71.05720146107079,42.35768477715064,0
-71.05717182181083,42.3576645280917,0
-71.05652371302401,42.35767361079476,0
-71.05649980932027,42.35769810029423,0
-71.0566283701193,42.35808913978494,0
-71.05697325520279,42.35807740920539,0
-71.05700819671353,42.35805404176438,0
-71.05718649028792,42.35805765772842,0
-71.05720146107079,42.35768477715064,0
</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</Placemark>
</Folder>
</Document>
</kml>