I look at all my documents in Print Layout (instead of Web or Normal). Just
recently, it started doing something strange. Usually, I set the margins
like I want them (1 inch all around) and in Print Layout, I see my text
starting 1 inch below the top of the page. All of the sudden, that is not
the case. It shows text right up to the top of the page...but in Print
Preview, it shows it with a 1 inch border.

What have I done and how can I fix it?