Not sure why, but Chrome/Safari are misinterpreting this gzip as a file, thus forcing a download (and there's no Content-Disposition header that I can see). Anyone else experiencing this?
Could be some Nginx config somewhere, had to install quite a lot of caching quick when this got on the front page :)
Can you have another check?
Disable/Enabled W3Cache, cleared out Memcache and it looks to be working now, not that technical but got the job done :)