I have an issue on SharePoint 2010 Foundation and the Quick Launch. We have a list of several sites on the Quick Launch that not every user has access to. For example, we have 2 sites called '2.0 Pondfield' and '5.0 Rheola'. User A has no access to either site, however, '2.0 Pondfield' shows on the Quick Launch but '5.0 Rheola' doesn't for User A. When I check the permissions for User A on each site, they have no permissions on either site. So why does one site show on the Quick Launch and the other doesn't? I've recorded a quick video to show this issue and you can download it on the link below.