Text / Credits fail to scroll during playback

I'm running Nero2014 Platinum on Win 7 64-bit. I have now tried to use the Text effect: Credits while making a DVD. I have entered all my data, formatted, and clicked Done. During playback of my movie, the first one or two credits scroll up (with difficulty), but the remaining 12 credits are not displayed. When I click Edit, all the credit text is visible (when I scroll up/down). Can you suggest a remedy please.
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