[support] drupal 5.7 not showing main page

[Jordi Moles Blanco]

Hi, i've been using drupal 5.7 for a while and everything worked just
great till some days ago. The thing is that i've never touched anything
at all of the global configuration or even modules installed since the
week i set up the website.

Anyway... i've noticed that when for example i edit a "page" that is
published in the mainpage, the row from the node_access table just
disappears.
It's there when i create the page, or the blog entry and so on. After
that, it is shown in the mainpage, everyone can see it, but if after
that
i want to edit the blog entry or the page or whatever, it disappears
from that table and then you have to be logged in to access the content,
and that's not what i want.

It's not only about the mainpage, it happens with any node at all i want
to edit once i've already create it, it becomes only available to
registered users.

The message shown on the page is that "You are not authorised to see
this content"

Is it a bug? Can i apply any patch?

Thank you.