This is a fairly common problem with Word 2013. See, for example:
http://answers.microsoft.com/en-us/o...=1402783050672
http://answers.microsoft.com/en-us/o...6-080f2fe33cc7
Aside from re-starting Word, the only effective solution is to update your display driver.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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