google maps no longer works!

On multiple vtiger instances "show map" feature no longer works, bu apikey was configured long ago, and only error I have is the following in javascript console:

[Error] Failed to load resource: the server responded with a status of 400 () (GetViewportInfo, line 0) https://maps.googleapis.com/$rpc/google.internal.maps.mapsjs.v1.MapsJsInternalService/GetViewportInfo