Hello! I've got the same problem, sometimes it works, and sometimes not... Sometimes i've got blue marker and custom icon on the same screen!
I use a KMZ , packed with the customicon with relative path. My kmz seems ok in googleMap, googleearth...and usualy i've got no problem...but sometimes... this thing happens ! Do you have found a solution ? thx! > -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-maps-js-api-v3/-/fJW2VeLGpMkJ. 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.