Zend certified PHP/Magento developer

Customers Grid’s Filters Button is disabled

I just mount a developer environment (copy from my production environment). When I log in to the administrator and go to Customers > All Customers, the Customers Grid display weel. However, the “Filters” Button is showing as disabled, and I can’t filter the grid:

enter image description here

This doesn’t happen in the production environment. Do you have some idea of what could cause it?

Thanks.