In my magento's "Manage Categories" page, clicking the + sign for a particular category, makes the plus sign disappears and no subcategories are displayed.
If I access category tree, by selecting Catalog > Manage Products > (select product) > Categories tab, the category tree works ok.
- entity_id: 7
- parent_id: 2
- path: 1/2/7
- position: 1
- level: 2
- children_count: 22252
Any suggestions about this issue?