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Same problem. Figured it out that it was apostrophes after analyzing messages from my daughter tonight and seeing that my LG flip phone had blank spaces in preview pane words that would normally have an apostrophe. The messages showed as rectangles when I opened them. The one message that came through completely as text did not have any apostrophes in it.
I have had text messages from other senders without any problems. And then I found this website and found the reason for the problem.