Try a force-refresh with either [ctrl|shift|option]-F5 depending on your browser/platform.
Looks like the CSS has changed or not downloaded correctly to your machine, so the styling is missing.
Your browser then caches the screwed up styling and the site wont display until that is invalidated.
If your ISP is caching it, then there is nothing you can really do....
So, you're best bet is to open the browser, go to this site then hit either:
Ctrl-F5, Option-F5 or Shift-F5.
Ctrl-F5 worked, thanks for that, don't know why I didn't think of it.