How's the home page look?

I'd been using a caching service to speed up page delivery (the service would cache images and certain static files, such as CSS). Worked great up until a couple weeks ago, when I started getting complaints like yours - for some reason the caching service sporadically wasn't able to connect to the site for non-cached stuff, would think the site was down and would serve up an old cached version of the home page instead.

I turned it off (and switched the DNS servers from the caching service's to my Web host). That should fix the outdated-home-page problem, because your browser requests shouldn't be going through the caching service anymore. But now I need to look at other ways to tune performance on the site.

Because I never saw it, either, and it can be hard to fix something you don't see. I was finally able to replicate it by logging out of the site, purging my browser's cache and hitting reload. And then I had the oh-so-brilliant idea of looking at the site's source code, where I noticed the incorrect URLs for the CSS stylesheets (basically text files that tell your browser how to display a Web page) - and just after I did that, somebody who obviously is way better than me at this stuff sent me a link to a doc on https and Drupal sites that gave me the idea on how to fix it.

I actually used to have an SSL certificate, which is why my site still has a separate https directory tree, but didn't pay to renew it when I stopped running a payment system on the site. https is the way to go, but to be honest, now that I have a stopgap fix for the issue that popped up this week, I figure I have more important things to fix (such as mobile templates showing up for desktop Chrome users).

But I'd have to do some reconfiguring and I'm lazy.