I give up

just to confirm, did you already tried this article? https://wp-events-plugin.com/documentation/google-maps/api-key/

Don’t know how many times. Also I deactivated all other plugins to verify that there’s no conflict. No success. As I wrote before. At other plugins the API key works instantly and flawless.

Can you post a link to your site?

For sure. Here’s the event list, currently on a sub-domain: https://gartenwoche2016.jardino.ch/veranstaltungen. For testing purposes I created two events.

It’s possible this conflict caused by your theme or another plugin. To check if it is, can you test with all other plugins deactivated and while running the default WordPress theme?

I had the same problem. I removed the “St” from the end of the street address and it suddenly started working.

Good luck!

I absolutely don’t know why. But after working on my site again after one week suddenly it works like a charm. Many thanks for all the help and your attention!