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Thank you for your response. I'm using Google Chrome Version 63.0.3239.132 (Official Build) (64-bit) and it is is up to date on a mac 10.10.5. I also have a tittle and four tags.

I would recommend trying a different browser. If that doesn't work- there may be an issue with the content of your post.
Maybe you can shorten it, or remove some images.

Thanks. I did try Safari and do not have pictures, just text, 5 small paragraphs and 4 tags :(

Try to copy it all, paste in a safe location
Clear the form and start over.
Make sure all tags are separated by just a space.