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You are most likely attempting to do this for text inside a table. If you try this tip while in a table, you will get the result you mention. Try cutting and pasting the "Takeaway" blurb in any article, and try this - it doesn't work because the Takeaway blurb is a table. To see for yourself, right-click on any text in the copied "blurb", and you'll see options to edit table elements - these are only available if it is a table.

It has nothing to do with your mouse!