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You could identify the container of the post (by looking at the source of a post that's causing the issue; the container would be the div or the td that's immediately surrounding the text of the post), and assign "overflow: hidden" to it in the style.css of your theme. Or try what you get with "overflow: auto" or "overflow: scroll". Not sure this helps, just a guess. If you post a link, helpful people can look into the actual scenario, rather than taking a guess.
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