Hello JFB,
Thank you for contacting us about fixing a BoldGrid site after adding an SSL. Installing an SSL does not make any actual changes to your site, you must also change your site name from http to https.
If you are still having issues you may have to do a find and replace in your database to update the URL. There are also many WordPress plugins available for implementing an SSL, that will handle this for you.
Ensure any images or resources on the page are being called in over https, since it will break the security chain. For example, if you have an image on your page from an “http” source, it will cause this security message.
Thank you,
John-Paul