I just uploaded a geo-located model of a building. The SKP file uploads fine, but the created KMZ will not load in Google Earth. However, if I create a KMZ directly from Sketchup it loads fine. Comparing the 3DW version of the KMZ with the Sketchup version, I notice the former is 6 kbytes larger (8352 to 8346). That additional data is apparently rendering the file uncongenial to GE.
I just uploaded a revised version of the model. No changes that should affect this problem. The new version has the same problem, but the Sketchup KMZ still loads fine.
I analyzed all materials, and the only difference in my local kmz export versus yours was the pixel density, and that’s the difference between Mac & PC, so THAT’S not the issue. All other differences are VERY subtle, so I’m still not getting it.