PositiveSSL certificate keeps giving the untrusted issuer warnings in browser

[Ian Evans]

On 04/09/2011 7:46 PM, Ian Evans wrote:
> Since I'm working on a Facebook app, the self-signed certificate I
> created for SSL access to my admin area is no longer useful.
>
> I grabbed a PositiveSSL cert from Comodo, but after following the
> instructions here ( http://kbeezie.com/view/free-ssl-with-nginx/2/ ) but
> still get the untrusted or self-signed warnings.

Upon further testing I see that it's still using the old cert despite 
issuing a kill -HUP.

How do I get nginx to start using the new cert?