Database Update makes my categories gone on the list

Hi again folks.

I have recovered a backup of my DB from my wp 1.5.2 before the crash, and put it on the new db for wp 2.0. The upgrade process work well, and the categories exist in the db, posts, etc etc etc. All well, but list_cats an wp_list_cats don′t work. If I use wp_list_cats, it says there aren′t any categories, and if I use list_cats, simply I get nothing, all blank, nada. But the posts works, they show their categories, and the links & permalinks to each category works fine. Only list_cats and wp_list_cats don′t work to display the category lists. Can be that the upgrade proccess have messed in some way the categories table in the db in some way? I tried to upgrade de old DB many times (deleting and upload the backup each time), and all I get is that. Someone knows a way to fix that?