I'm trying to publish a .dwg to Googl Earth. When I go through the wizard everything is fine until I come to the end. It succesfully creates a .kmz file, but when I click on "View" it gives an error "Viewer Failed". I'm running Windows 7, and Google Earth 5.0.
I have also had this problem. I am running Civil 3D 2010 on Windows 7 with Google Earth Pro V6.
Rebooting the PC did not work for me. But, reinstalling Google Earth did resolve the problem.
Maybe it had just lost the link between Civil & Google Earth.