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    <blockquote> <p>If I switch this to clear everything and remove the ID from the create Placemark call, this at least doesn't crash.</p> </blockquote> <p>The issue is that you can't remove then add an object with the same ID that quickly. In simple terms it is the call to <code>ge.createPlacemark('DARTselectBox')</code> that is causing the crash because the ID <code>DARTselectBox</code> is still being used internally. You can eventually use it again, but the time is dependent on the WebBrowser control's garbage collection.</p> <p>To avoid the crash you could try <a href="http://code.google.com/apis/earth/documentation/reference/interface_kml_object.html#a3b5729a874f2a5fb8f3ce7699ac31038" rel="nofollow">calling release</a> on the placemark so that the ID is freed immediately. See this note on what calling <code>release</code> does (<em>My emphasis</em>)</p> <blockquote> <p>Permanently deletes an object, <em>allowing its ID to be reused</em>. Attempting to access the object once it is released will result in an error.</p> </blockquote> <p>Failing that you could simply toggle the visible state of the placemark, rather than adding and removing it each time.</p> <p>The actual issue with the ID reuse is listed as a bug and there is some <a href="https://code.google.com/p/earth-api-samples/issues/detail?id=253" rel="nofollow">more information on the problem here</a></p> <p><strong>Edit:</strong></p> <p>Looking at it looks like there could be a bug with the release method.</p> <p>If you read the link I posted <code>code.google.com/p/earth-api-samples/issues/detail?id=253</code> some of the comments at the bottom seem to suggest this.</p> <p>Anyhow, a hash would work, so would an incremental counter. But I don't understand why you don't simply set the visibility to false, or else create a Placemark without an ID at all and simply keep a reference to it during the operation. </p> <p>The display issue is possibly due to tessellation and altitude mode.</p> <p>Try calling <code>setTessellate(true)</code> on the Placemarks geometry object and also make sure the altitude mode is set to <code>clampToGround</code> - to do this you call <code>setAltitudeMode(ge.ALTITUDE_CLAMP_TO_GROUND)</code> - again on the Placemarks geometry object.</p> <p>So you have</p> <pre><code>var lineString = ge.createLineString(''); lineString.getCoordinates().pushLatLngAlt( ... ); lineString.setTessellate(true); lineString.setAltitudeMode(ge.ALTITUDE_CLAMP_TO_GROUND); </code></pre> <p>If that doesn't work, can you try turning the terrain layer off and checking if the lines are there or not?</p> <p>Also, I have written a free control library that does lots with the API - it is GPL so you can use it pretty much however you like. It does cover lots of things like this. <a href="http://code.google.com/p/winforms-geplugin-control-library/" rel="nofollow">http://code.google.com/p/winforms-geplugin-control-library/</a></p>
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    1. COI tried both just releasing the placemark, and removing it as before and then releasing it. Neither of these seemed to work. I think I might just have to change the id to be some kind of hash of the datetime and just store whatever it previously was.
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    2. COI did end up just keeping a reference to the placemark. That worked best. So that part is solved, but I am still not sure why the placemark won't display properly.
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    3. COOk I will address the display issue in an edit to my answer.
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