Website shows up blank

I have a website in box6. The URL is "www dot hoeakaha dot cer33 dot com" When I try to access it all that appears is a blank screen. The site was constructed using website builder. When I go in as admin and preview the home page I also get a blank screen but when I look at the source code the site appears to be there.

The web builder interface has changed so I presume there has been an upgrade. Do I need to do something to make my site compatible with the latest version of web builder?

Thanks in advance for your help