I am using magento copy category extension, this extension copies categories successfully.
Manage Product page in
Categories tab, sub-categories of the original category (that i copied) disappears from the category tree. The copied categories are ok. But when i add a sub category manually to the original category, it solves the problem and subcategories appears.
It shows that sub-categories were not disturbed by the module but problem arises from somewhere else.
Thanks in advance for your help