<?php wp_footer(); ?>
So please check first within your template (e.g. wp-content/themes/YOUR_TEMPLATE_NAME/footer.php) if the function wp_footer() is present and if not, please add it to your theme as many other plugins and WordPress itself also depends on it.
If you don´t have the file footer.php, please check if the function wp_footer() is present in the file index.php.
If you added the template tag and the message “loading map – please wait…” gets displayed anyway, please follow the steps from the readme-first post in the support forum, as this could be a conflict with another plugin.
Please note that this setting has been removed in pro v1.5.5 and was re-added with v1.5.6 for compatibility reasons – so if you changed this setting in the free version and upgraded to current pro version, you have to change this setting again (once only).