Both of these indicate that the page you are now on is secured using SSL encryption to communicate with our secure web server. It is possible that you may see a warning stating that a certificate has expired.
Every browser comes with installed certificates which have expiration dates.
If you should see this type of warning message, it is not a bug nor a problem with our web site. This will usually happen if you are using an older version of the browser software. Thawte has a helpful chart listing what browsers may need to be updated. Just click on the icon at above. Your browser can be upgraded by going to the companies web site.