and run it, the layer is centered over the US, take the same code and replace the arcgis lib with the 2.4 version 'agslib-2.4-2011-07-25.swc' run it again without any code changes and the kml layer is about 3000 km south - now covering central america.
Loading the kmz file into google earth, shows the layer covering the US, so the example running with the Flex 3.0 lib shows the correct translation.
Just curious is the error in rendering caused by the kmz service utility or ?? thanks, steve