Content Not Found

I’m using a child theme for Pinboard in a sub-directory folder (eg. https://domain.com/blog). When I look at the blog posts, they display fine. But the home page is not aggregating the blog posts, instead stating “Content not found: the content you are looking for could not be found.” The header of the site also says “Page not found” though the theme displays correctly.

I’ve done a re-download of Pinboard from the host site rather than www.ads-software.com and installed it. Nothing changed. I believe I have done everything I need to for the sub-directory move (index.php & .htaccess). Am I missing something?