I have typed text into a post here, copied it into Microsoft Word to spell/grammar check it, then copied it back into the post box with the above-mentioned truncations as a result.
That's because MS Word converts the dash you type here to an em-dash, which causes either the page code or database here that stores the posts to gag when you paste it back into a post. I've even encountered the inability to paste from one post to another on this site without hitting the special character truncation bug.