thumbnails links broken after plugin activation

Hi,

possibly your homepage is still using https:// references for thumbnails, this is often fixed by clearing all caches your website uses. For more information about tracking down the cause of your mixed content issues see https://really-simple-ssl.com/knowledge-base/how-to-track-down-mixed-content-or-insecure-content/. Can you provide me with your site address so I can have a look?