This is the second WordPress site I've built. I'm having an odd error where all of my child pages 404. If I make a new child page and publish, it immediately 404s. This also happens for paged navigation.
I know it has something to do with permalinks, but I can't figure out what. Right now I have Custom Structure selected and /%category%/%postname%/ in the field. I've tried clearing the .htaccess file and remaking it, but that won't work. I have custom post type UI plugin installed. I have this theme installed.