Display nonprinting characters (Ctrl+*) so that you can see what is causing
the "blank" page. Almost certainly you will see one or more empty paragraphs
(indicated by paragraph marks: ¶). Delete these. If page 5 ends with a
table, you will not be able to delete the final paragraph mark after the
table, which holds document-level formatting. But you can select it and
format it to a small point size (1 point) or apply the Hidden font property
(it will not vanish until you hide nonprinting characters by pressing Ctrl+*
again).

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Suzanne S. Barnhill
Microsoft MVP (Word)