I came across hundreds of entries in our store that look like the below:

PHP Fatal error:  Uncaught exception 'PDOException' with message 'SQLSTATE[42S02]: Base table or view not found: 1146 Table 'mysite_mysite.core_file_storage' doesn't exist' in /home/mysite/public_html/lib/Zend/Db/Statement/Pdo.php:228

Magento is trying to pull up an image that doesn't exist. This is a bug in Magento 1.5.x (1.5.1 in my case) and can be fixed by running the following two SQL queries on your DB.

CREATE TABLE `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 NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `parent_id` INT(10) UNSIGNED NULL DEFAULT NULL,
  PRIMARY KEY (`directory_id`),
  UNIQUE INDEX `IDX_DIRECTORY_PATH` (`name`, `path`),
  INDEX `parent_id` (`parent_id`),
  CONSTRAINT `FK_DIRECTORY_PARENT_ID` FOREIGN KEY (`parent_id`) REFERENCES `core_directory_storage` (`directory_id`) ON UPDATE CASCADE ON DELETE CASCADE
) COMMENT='Directory storage' COLLATE='utf8_general_ci' ENGINE=InnoDB ROW_FORMAT=DEFAULT;


CREATE TABLE `core_file_storage` (
  `file_id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `content` LONGBLOB NOT NULL,
  `upload_time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `filename` VARCHAR(255) NOT NULL DEFAULT '',
  `directory_id` INT(10) UNSIGNED NULL DEFAULT NULL,
  `directory` VARCHAR(255) NULL DEFAULT NULL,
  PRIMARY KEY (`file_id`),
  UNIQUE INDEX `IDX_FILENAME` (`filename`, `directory`),
  INDEX `directory_id` (`directory_id`),
  CONSTRAINT `FK_FILE_DIRECTORY` FOREIGN KEY (`directory_id`) REFERENCES `core_directory_storage` (`directory_id`) ON UPDATE CASCADE ON DELETE CASCADE
) COMMENT='File storage' COLLATE='utf8_general_ci' ENGINE=InnoDB ROW_FORMAT=DEFAULT;