I have this too
The cause is different - the page is created with CSS Scupltor 3 and incorporates a menu created using CSS Menu Writer. It also has a hand made 2 field form for newsletter sign up that uses Universal Email to send it as an html email.
When I try to insert the google pro map I get the place cursor between body tags message.
If I remove the universal email I can the insert a google pro map.
It would appear that Google Pro Maps is confused by the head and body tags generated for the html email.
Can you please look at this as a matter of urgency as I need to go live with this site on Tuesday.