My map is gray and there are no entry markers
The problem is that your entries haven't been geolocated yet, so you must first check if your Google Maps API Key is correctly configured: Signing up for a Google Maps API Key.
After doing this, go back to each one of your form entries, they should appear with this message:
Click on "Geocode This Address":
That should make the entry shows up on the map. Otherwise, get in touch with us so we can provide further assistance: https://www.gravitykit.com/support/