I’m having a similar issue. I’m trying to display bike ride maps on my site. I have both the kml and gpx files from the ride, but really want to display the gpx, speed and altitude data. After much fiddling, I have the kml file displaying the route, but cannot get the gpx file to parse. I just get the highest level world map. I went as far as searching here, and downloading a gpx from someones working site to rule out the tool that created mine. I have disabled all other plugins with no success. Any other ideas?
Running WP 2.8.x
PHP 5.2.x
Site is here: https://pinards.com/wp2/
Thanks!