7.4 & 7.4.1 - As a user who is not logged in go to "Who's Online". In the right column click on the link for a specific thread. You get "File not found: scripts/show.inc.php" together with the login page. I have not figured out if a non-logged-in user should be able to click through to an actual thread based upon the permissions for non-logged-in users BUT he really should not be getting a "File not found" type message (and there is no /scripts/show.inc.php).
