Does the problem occur in other documents? If not, the problem document may have some internal corruption.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

It only occurs with this Adobe produced font with MS Word. It occurs in newly created documents as well as previously created ones. I can be editing fine with everything behaving, then suddenly it will start becoming unstable. I have found it i tell word to print (to printer or to adobe pdf) it will reset things correctly (often but not guaranteed).