[bmwfans]

With the following modification on the plugin, now everything seems OK again

previously:

   if(strtolower(substr($thisimg, 0, 5)) == 'https') //If https site
      $secure_og = 'secure_url';
    else
      $secure_og = '';

    $bop5_og_tags .= "<meta property=\"og:image$secure_og\" content=\"$thisimg\" />\r\n";

now:

 if(strtolower(substr($thisimg, 0, 5)) == 'https') //If https site
      $secure_og = 'secure_url';
    else
      $secure_og = '';

      $bop5_og_tags .= "<meta property=\"og:image\" content=\"$thisimg\" />\r\n<meta property=\"og:image$secure_og\" content=\"$thisimg\" />\r\n";