It's possible the document has acquired some of corruption. Corrupt documents can often be 'repaired' by inserting a new, empty, paragraph at the very end, copying everything except that new paragraph to a new document based on the same template (headers & footers may need to be copied separately), closing the old document and saving the new one over it.

Another, unlikely possibility, is that your document contains a PRINT field that suppresses the second page's output. Pressing Alt-F9 to display Word's field codes should reveal whether your document has such a field.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]