importing waypoints to Earthmate

I want to get waypoints in Basecamp into Earthmate.  I was able to import a test file (eight waypoints) into Garmin Explore web site (explore.garmin.com/map) as a gpx file.  I was then able to sync with Earthmate and it worked wonderfully.  Now I've tried importing a larger file (21 waypoints) and I can't get it to work.  I get no errors.  The circle goes around for a fraction of a second and then just stops.  I've rebooted my computer, cleared my browser cache and tried gpx and klm.  Nothing works.  And I've tried importing into tracks and routes.  I've read that the maximum number of waypoints imported is 500.  I have about 50 waypoints, 140 tracks, and 130 messages in the system.  Any help is appreciated.