It looks there is a problem in kml generation from Therion, because in the way it generated it only first polyline is displayed. When I added manually the same tags for second polyline it looks OK.
<?xml version="1.0" encoding="UTF-8"?>
<Folder>
<Style id="ThMapStyle"> <PolyStyle> <fill>1</fill> <outline>0</outline> </PolyStyle> </Style>
<name><![CDATA[7524/120 Steebschacht (Spezial)]]></name>
<description><![CDATA[Length 52 m<br>Depth 4 m<br>]]></description>
<Placemark>
<styleUrl>#ThMapStyle</styleUrl>
<name><![CDATA[]]></name>
<Style> <PolyStyle> <color>bfcc9999</color> </PolyStyle> </Style>
<MultiGeometry>
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>
9.74555418324174,48.43749514571515,0.00000000000000 9.74560345525943,48.43749822300868,0.00000000000000 9.74564409921618,48.43745320641083,0.00000000000000 9.74556506923348,48.43740786691496,0.00000000000000
</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</MultiGeometry>
</Placemark>
<Placemark>
<styleUrl>#ThMapStyle</styleUrl>
<Style> <PolyStyle> <color>bfcc9999</color> </PolyStyle> </Style>
<MultiGeometry>
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>
9.74479382219246,48.43768823902057,0.00000000000000 9.74488546711236,48.43766713250446,0.00000000000000 9.74486108946851,48.43763413167048,0.00000000000000 9.74477263206030,48.43766347610486,0.00000000000000
</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</MultiGeometry>
</Placemark>
</Folder>
</kml>
Martin S.
