can’t add markers

Hi,

Since I did the update of the lastest version, I have some issues to add a marker.
When I go on map, modify map, add a marker, I don’t have any problems to add the informations like address or link or image, but I can’t simply add the marker. The blue button where I suppose, must appear “add a marker” is just totaly blue and when I click on it nothing happens, it doesn’t add the marker, neither reload the page or anything.

I am currently using WP Google maps add on pro, on google chrome.

Also, on the same page, the blue buttons for “add polygons”, “add categories” and “add polylines” stay blue and nothing happens if i click on it.

How can I fix it?

Thanks