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Hi ldgante,
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I tried replicating this on a Vista Business laptop with Office 2007, and it worked fine for me. I tried clicking the [<<] and [>>] buttons with the mouse, pressing the PgUp and PgDown, Ctrl+Alt+A and Ctrl+Alt+Z... all worked OK.
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You may need to do give more detail of what you did leading up to the problem. Exactly what buttons/keys you were pressing etc.
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