Thanks for your kind help.
I have one test site which runs this and is nearly an exact copy of my live site, there uninstall, reinstall worked fine and maps show.
However when I did the exact same procedure on the live site it doesnt. Which is strange. I even repeated the procedure and still no change.
I erased the API key in the plugin and I didnt notice any change, I still don't have maps. there should be a map here: http://www.dolcevia.com/nl/italie-reizen/regio/abruzzen
. I've refreshed the cache many times and still nothing.