In fact to go further it seems to be the shortcode functionality of Jetpack that is causing the maps not to display. If I disable the shortcode functionality of Jetpack then I can get the maps to show.
I was also suffering from this problem and I found that something in the Jetpack plugin is causing the map not to display. I suspect that this is going to be a major hindrance to many who may be wanting to use this plugin.
Thanks, I tried that (that very link in fact) but it didn’t work. I suspect because of the complexity of the theme I’m using. I’ll have some time to think about this more deeply in the next couple of days.