Hi MrMusic,
I believe I'm using the "Category View: Default Layout" for JoomGallery, according to the Menu Item Type.
I have researched up on what you mean by 'template override'.... and with a bit of poking around I fixed the issue and the google maps is displaying again.
Thank you you legend!
I found a bit of confusion with the template "Create Overrides" functionality. When I just now created the override from joomla frontend, it copied in the original view as a backup file. eg:
templates/theme3206/html/com_joomgallery/detail/default-20210125-235549.php
So I had to manually copy these so called "override" files to replace the main files. eg:
cp default-20210125-235549.php default.php
cp default_commentsarea-20210125-235549.php default_commentsarea.php
cp default_footer-20210125-235549.php default_footer.php
cp default_header-20210125-235549.php default_header.php
I guess I should recreate the overrides for the other two existing dirs - gallery & category
cheers