JJWdesign - Google Map not displaying in 7.6.5


I installed the JJW google maps module V2.1.20 without errors in an upgraded SuiteCRM. The problem is that the maps in the Map menu are not being displayed. In stead of the map there is a grey square.

The maps in the MapAreas and MapMarkers menu are being displayed correctly and Geocoding is working.

I tried some suggestions in other posts, but without any success.

Can anyone help ?

Thanks in advance