Empty body in node edit page I have created a node entering content for its body field; when I return to the node edit form, the body field is empty.

What may cause this problem?
If you are using node translations, when Drupal gets an empty body, it first search a translation with non empty body and, if found, shows it. That's probably why you are viewing body content in the node view but an empty textarea in the node edit form, the content surely comes from one translation.