title: Wordpress links all https but connection not fully secure
body: <p>I've reconfigured a Wordpress site to use https and although there are no http links appearing in the html source Chrome still says "connection not fully secure". </p>
  
  <p>I've read <a href="https://stackoverflow.com/questions/46563293/chrome-you-connection-to-this-site-is-not-fully-secure">this post</a> and I find in Developer Tools > Network there is a jpg file listed as being on an http connection. However I've changed the only reference to this file in the database in table wp_posts in field guid to be https, refreshed the browser cache but it is still listed as http although not appearing in the source.</p>
  
  <p>Other non-wordpress https sites on the same server show the secure sign so the certificate must be installed correctly.</p>
  
  <p>I've used the online checker at <a href="http://www.whynopadlock.com" rel="nofollow noreferrer">www.whynopadlock.com</a> and the only item it flags as a fail is the jpg image, which I've changed? Is there a WP cache, I can't see an cache plugins in admin.</p>