For those that struggle with viewing multiple pages of new posts, there is an easy solution.
When you search for new or recent posts since your last visit, it often times shows there are multiple pages, but once you finish with the first one and click page 2, they are all gone.
The work-around that I use is to open all the pages right away in new windows or tabs. In other words, if it says there are 75 new posts (at 25 per page), open page 1, 2, and 3 all in separate windows or tabs, then they will be there until you close the windows. Otherwise the system reruns the search to bring you page two, and since you’ve been at the site awhile already, it thinks there are no more new posts.