It appears that the plug-in responsible was Recipe SEO
I deactivated all of my plug-ins and it now works. I will now re-activate the plug-ins one at a time to see if there is one causing the problem.
Funny thing is that it is just within that one post. I can save changes in other posts without a problem.
No, I have been using it for about a month. This happened after I inserted a photo via URL. The photo hasn’t been saved. I tried adding the photo from a file too without success.
I can add one, but it won’t save it to the post.
