Thanks by the feedback Greg.
I deactivate all my plugins, except Just Writing. No effect. Any text edited and saved under the Just Writing workflow doesn’t appear on the text block (outside Just Writing), isn’t published on the live page. I also tried to create one blog post with Just Writing, but same result.
I identified the “lost pages” as one tool of Advanced Page Manager plugin. It was one another plugin i deactivate to test Just Writing standing alone.
I can’t identify the problem.