getting Google error even after selecting a different geocoding handler

I have a Geofield, field_location, configured to Geocode from another field, field_address, which is a Postal Address field.

Originally, I chose Google Geocoder as the handler in the field_location settings section, but I kept getting error messages in the Drupal log:

Exception: Google API returned bad status.\nStatus: ZERO_RESULTS in geocoder_google() (line 73 of /home/mysite/public_html/sites/all/modules/geocoder/plugins/geocoder_handler/google.inc).

So I tried editing the field settings and chose different geocoding handlers, including MapQuest, GeoJSON, and Latitude/Longitude.

I'm still getting Google API errors, even though I've specified a different handler! Why would that be?

I'm using now have Geocoder 7.x-1.2+23-dev (2015-Sep-30).

I've entered a 300ms delay on the config page.

I can't seem to get Geocoder to geocode an address.

Any suggestions?

Thanks!