Did you run your KML through a validator? http://www.kmlvalidator.com/home.htm
Does your file exceed the size limits? http://code.google.com/apis/kml/documentation/mapsSupport.html -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to google-maps-js-api-v3@googlegroups.com. To unsubscribe from this group, send email to google-maps-js-api-v3+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.