Possibly this is what is causing the error script - "The session state
() didn't match the state parameter (token)"?
The ID and secret were supplied by the API, and I filled in the redirect URL according to the suggestion from the plugin on the WP backend (rather long url - ending with xxxxwp-admin/admin.php?page=configure_google&action=auth
Each time, I tried the clear cache (from the browser Firefox, not sure if this the cache you meant) - will try it again with a clear cache plugin in WP blog.
Thanks for your help - also, I did try resetting the secret (not the API ID), each time, but no help -
The token is the only error I have encountered. Thanks so much for any help.