Unable to import reviews from Google or Yelp. 

Does the Google Crawl or Review Funnel work? 

You can use the following link to test your API Key and Places ID. This is the link that the plugin uses to download the reviews. Just replace with your placed and api key values in the URL.

https://maps.googleapis.com/maps/api/place/details/json?placeid=YOUR_PLACE_ID&key=YOUR_API_KEY

For Yelp, are you using the Yelp Crawl or Review Funnel? What is the Yelp URL you are using?