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Hallo!
I am using PS 1.7.6.4
There are categories and few sub categories with sub-sub categories, but only one subcategorie is working ok. 
All was working ok for some time. But last 4 month i didn't have to create any new categeories.
For no i can create only main categorie but no subcategorie as when creating subcategory, i can not chose parent categorie from the categorie tree because it is not showing up there at all.

Hope that someone can help on that

Ok it looks like this is reflecting to all categories at all.