Post won't update when saved

Can you add a photo via upload?

I can add one, but it won’t save it to the post.

Is this a new site, or has something changed recently?

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.

Funny thing is that it is just within that one post. I can save changes in other posts without a problem.

Did you ever resolve this? I have this problem in all of my posts. I can create new ones, but I can’t update (edit) anything already existing.