Would it be a geolocated model for GE? In that case you can also upload the kmz file from the web interface.

Hi David, It sounds like you're running into this issue: http://sketchup.google.com/support/bin/answer.py?hl=en&answer=162724 In SketchUp 7.1, there's a known issue where SketchUp will ignore input to the Measurements box when you click or tab into the box prior to typing. Cheers!