Resource types

Hi

I'm trying to add a resource to a section of a course but I'm having problems. If I do it in section 0, everything goes perfect. But in other sections I only get a blank page.

I have checked the path to the new resource and everything seems to be ok. At section number 0 the new resource url is like this:

http://mydomain.com/moodle/course/modedit.php?add=resource&type=html&course=2&section=0&return=0

And in other sections the url is the same one instead section number. But the new resource doesn't appear.

It happens the same adding an activity. What's wrong with my Moodle?

Moodle release version: Moodle 1.8 + (2007021503)

Thanks