Something gone bad with the update you released yesterday.
Looks like the CSS for Engadget style is missing.
I tried emptying W3 Total Cache and deactivating Amazon Cloudfront, but it's not a matter of old cache.
I brosed the site in incognito mode too, to no avail.
So, it's the plugin.
Here is a capture of how it looks like after the upgrade.
You can reach the site if you want to verify CSS/JS files and the like: