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I suspect the problem was a URL from a post where I used a ’ in a post title that makes it into the slug.
There is a problem with WP allowing the ’ (U+02BC) to be placed in a slug.
John thinks it is a server permissions problem. When the site was first setup some other plugins had permission problem. I have gone over permissions for this site with Go Daddy and all others are working. I don't think it is a permission problem, but I can't say it isn't.