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Block Rewrite not working

Block Rewrite not working

Hi all.
In config file of my module I've rewrite some core blocks, after that corresponding forms opens as empty.
I've added logs to my function which were rewritten, but they are not working (looks like it never run).
pages are working again when I disable rewriting from config.xml.


Also I've tried to remove all content from my class, and it still not works.

class NAMESPASE_MODULE_Block_Adminhtml_Category_Tab_Attributes extends Mage_Adminhtml_Block_Catalog_Category_Tab_Attributes



Magento version

It also us other modules.

Module correctly works in other magento instances.


Did anyone has something similar?


How can it be solved?