Hi Matt
Thanks a lot for the quick reply 🙂
The website is not online yet – I just have a local instance.
The theme (I used before I ran into the problems) was https://themeforest.net/item/trendblog-creative-vintage-elegant-blog-wordpress-theme/16309255 – but as I wrote, I switched to Twenty Seventeen and also had the same problem.
Anyway I’ll let ou know as soon as possible when the website goes online (should be in the next few days.
UPDATE 1: Just found out that “#google_maps_markers .cmb-add-row” has a display none. If I set it to display block I can add Markers with the included button.
But it’s just a workaround I guess. It’s still not possible to add new markers directly from the map.