This could be because of a few reasons:
1. You have an older version of our software. Please update to the latest version by using the download link found in your welcome email. You can always see what the latest version of our software is by going to www.usdatavault.com/version.htm
2. Your internet connection went down
3. Our network is down - usually, on the VERY rare occasions that this happens, we email all of our customers.