I've got a couple of issues going on.
First, under "Settings > Reading > Front Page Display > I've got 'Static Page' ticked, and then under that it has a drop down selection menu for "Front Page" and "Posts Page". I've got them both set to my selected static page, and there is a warning message that says "These pages should not be the same!", however when I change the "Posts Page" to the only other page that I've made - an "about" page - everything gets all screwy and doesn't flow properly anymore.
What am I missing?
Also, and probably in conjunction with this somehow, is that when I try to add a 3rd page (I've only got the static front page, and an 'about' page right now), then the navigation no longer works, and clicking on the individual page links does not just bring up those individual pages, but all of the pages combined.
What I would ideally like to do is to manually set up page navigation, to include external links, but while trying to figure that out, I discovered these other issues.