Hello,
I tried your solution but I’m afraid I have the same problem :/
Here what I did, in /wp-content/plugins/wp-google-map-plugin/wp-google-map-plugin.php, I changed this line
wp_register_script( $script['handle'], $script['src'], $script['deps'], '', $where );
to
wp_enqueue_script( $script['handle'], $script['src'], $script['deps'], '', $where );
Map.js is still not loaded.
Thanks for your help.