I'm getting 500 Internal Server Errors on posts, according to the HTTP Header Check at http://www.webconfs.com/http-header-check.php.
The posts check out ok once if the cache is cleared, but then the error comes back on subsequent reloads of the posts. It goes away if I disable my cache program, W3TC. It doesn't seem to happen on the home page, or other pages (as opposed to posts) at all.
The posts show up ok (the viewer doesn't get a '500' error notice), but according to these header-check services, there's a problem.
It seems to be affecting different things on the site, like social sharing and cron jobs.
I've researched this as much as I can, but can't seem to get a handle on it.
Any help would be most appreciated.
My site is at http://www.humortimes.com.