Good shout, although a quick duck search didn't throw anything up for them doing anything long-term related. I was under the impression they have a "newest is best" policy. Happy to be shown differently though.

Edit: I think this confirms my thinking: https://www.nginx.com/blog/nginx-1-6-1-7-released/

No 500 easily showing, but server still reporting the old version. Are you the creator?

Yeah... That's a big one! Whoops!

It's back up now though, strange.