Move/copy/delete from info page doesn't work

Issue Summary

I'm running drupal 5.2 on an apache httpd 2.0 server.

To replicate:
1. create/edit a disk node
2. Click the "Browse files"
3. Click the "Info" link in one of the files
4. Select a move/copy/delete tab
5. Click the corresponding button

Result:
Nothing happens. There's no message after loading the page. The action was not performed.

I did this while logged in as the first user (user 1).