Drupal 7.40 settings.php changes.

settings.php

# DIFF REPLACE

-$conf['404_fast_paths_exclude'] = '/\/(?:styles)\//';
+$conf['404_fast_paths_exclude'] = '/\/(?:styles)|(?:system\/files)\//';

# ADD TO END OF FILE
/**
 * Theme debugging:
 *
 * When debugging is enabled:
 * - The markup of each template is surrounded by HTML comments that contain
 *   theming information, such as template file name suggestions.
 * - Note that this debugging markup will cause automated tests that directly
 *   check rendered HTML to fail.
 *
 * For more information about debugging theme templates, see
 * https://www.drupal.org/node/223440#theme-debug.
 *
 * Not recommended in production environments.
 *
 * Remove the leading hash sign to enable.
 */
# $conf['theme_debug'] = TRUE;