I just posted with pictures and got this little note at the bottom of my screen:
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I think it is due to pictures. I found that if I started a post with text only, posted that, then went back and edited my post, adding the picture URLs, it all worked out! Maybe it is public knowledge, and if so, I apologize for being late on it, but I thought I'd share it with my CCorner friends, knowing how we like to post pictures of our creations.