> I'm using a KMLLayer to load a KML file, which contains 955 placemarks.

It's getting a bit close to the maximum features limit
http://code.google.com/apis/kml/documentation/mapsSupport.html

There have been a few threads kicking around which suggest that
Google's KML parser will abort renderings of large, complex or slow-to-
serve files due to a timeout.  There's no clear indication that is the
root issue, but the result seems to be apparently 'random' failures.
Some people have had success by minimizing the delays under their
control, e.g. removing redirections, serving flat files instead of
building dynamically, finding fast hosting.

It would be nice if some failure type indication were available, this
is all guesswork.

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