Hi there,
I discovered yesterday that the problem seems to be when you are trying to use the shortcode in a widget area or advanced custom field etc. It works fine if you place the shortcode in a regular page.
I then discovered that if you leave the shortcode in the widget area or advanced custom field etc and then place the shortcode in the regular page, the map displays where it would via the widget area or advanced custom field etc and the only catch is that you’re left with a big gap where the map would be in the page.
I therefore added the following to my stylesheet…
section.entry #wpgmza_map {display:none !important;}
Hopefully other people will find this useful as a quick fix until the developer can get to the bottom of what’s causing this problem and release an update.