Hi guys,
I had the same issue after plugin’s update but I fixed it by modifying the files within the plugin folder to allow uploads by editors.
You need to make changes in two files :
– wp-gpx-maps_admin_tracks.php
Replace ‘manage_options’ (line 6) by ‘edit_others_pages’
– wp-gpx-maps-admin.php
Replace ‘manage_options’ (lines 15, 17, 35) by ‘edit_others_pages’
et voilà (hoping next update will do it otherwise we will have to do it again).