ZF-5606: Zend_Db::factory normalizes characters in namespace, so ZendX libraries are not found
on line 240: $adapterName = strtolower($adapterNamespace . '' . $adapter); $adapterName = str_replace(' ', '', ucwords(str_replace('_', ' ', $adapterName)));
This code make ZendX_Db_Adapter_Firebird to become Zendx_Db_Adapter, which can't be found on Linux...
Also problem for user's Db libraries.
Now can be soluted by using standard inicialization without ::factory() method, but it is a bug....