I immediately went to Newest Nodes. This showed: "Show nodes created within the past [1 v] days [Submit]" (that's a dropdown list and a submit button).

I use Newest Nodes on a daily basis. The only time I see that message is when I click Clear my 'last checked' time, so it doesn't have a cutoff time logged in the database for me. {edit}: When there are no more new posts When I've read all the posts that were listed"{/edit} in Newest Nodes for me, I click I've checked all these, which logs my 'last checked' time, so that Newest Nodes knows how far to go back next time. Then, when there's a new post and I load Newest Nodes, it just shows me the ones since I last clicked that button.

I am guessing that you've never clicked I've checked all these, so you've never saved your 'last checked' timestamp, so the server has no way of knowing how far back you want to read. If you start clicking that once you're done with the current Newest Nodes list, I think you'll find that it works as expected.

The I've checked all these button only shows up if I have unread posts. The Clear my 'last checked' time button only shows up if I have no unread posts. The "Show nodes created within the past [1 v] days [Submit]" paragraph only shows up if I've cleared my 'last checked' time, or on the rare occasion when I haven't read for more than a few days.