Hi all,
We've just released version 5.1.3509.4636 of the Google Earth Plug-in,
compiled against existing version 1.003 of the Google Earth API.
This is a bugfix release, resolving Issue 331 in the public issue
tracker (titled "fetchKml() fails on slower connections or fast
connections and large KML/KMZ files")
Over the next several days, the entire install base will be updated to
the new plug-in version. Also, all new plug-in downloads and installs
will be of this new version.
The release notes will be updated soon to reflect the new version:
http://code.google.com/apis/earth/documentation/releasenotes.html#2009-09-22
Thanks,
Roman