It certainly does not usually happen when I hit Return at the end of a paragraph, nor does it happen when I hit Return in the middle of a paragraph. I'm not sure what you mean by "particular text," but all of my text is the same. It *seems* to happen when I'm at the bottom of a page & hit Return to go to the next page. But it doesn't *always* happen then, just sometimes. As I said, I learned that if I immediately hit backspace the line of boxes disappeared, but for those where I just kept going (not knowing what to do to get rid of it) they seem to be permanently implanted.