In der Magento Version 1.5.0.1 fehlt das Anlegen einer Tabelle, was dazu führt, dass die Ordnerverwaltung beim Media Browser nicht geht. Es muss dazu die Tabelle core_directory_storage angelegt werden.

SET FOREIGN_KEY_CHECKS = 0;
CREATE TABLE IF NOT EXISTS `core_directory_storage` (
`directory_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL DEFAULT “,
`path` varchar(255) NOT NULL DEFAULT “,
`upload_time` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
`parent_id` int(10) unsigned DEFAULT NULL,
PRIMARY KEY (`directory_id`),
UNIQUE KEY `IDX_DIRECTORY_PATH` (`name`, `path`),
KEY `parent_id` (`parent_id`),
CONSTRAINT `FK_DIRECTORY_PARENT_ID` FOREIGN KEY (`parent_id`)
REFERENCES `PREFIX_core_directory_storage` (`directory_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT=’Directory storage‘;

Der passende Magento Thread ist hier zu finden:
http://www.magentocommerce.com/boards/viewthread/219878/