Benjette, can you see page 2 if you are logged into the admin panel?
I am having the same problem with my links page. Oddly, if I am not logged in, the page redirects as a 404. If I am logged in, the page renders normally. (And, of course, that means no one else anywhere can access it.)
There are no if_user logged in variables anywhere on the page. I have deactivated/removed plugins (no conflicts), reset permalink options (no improvement) and it still redirects to a 404.
This began with the upgrade to 2.3.