Documents that have been around for awhile have the potential to become corrupt over time. This is probably what happened here.
What you want to do is create a new document at the same size as the old one and then do what is called a Thumbnail Drag. You place the new document and the old in Thumbnail view, then select the pages you want to drag in to the new document. Shift+click for each page or just drag and select. Then will they are highlighted drag them into the new document next to the first page. You'll know you have it right when your dragged pages "snap" to the single page in the new document. Save and then you have a new fresh document without the corruption of the old one.
Erik Youngren
Composing: Pueblo Publishers
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