I recently ran Software Update in my son's MBP (OSX 10.7.5) and discovered that after entering the name and password in the SU window, in addition to downloading software from Apple's server this action also unlocked the padlocks in both the Network and Shared panes of System Preferences. I locked both panes and tried SU again but got the same result. This was done from a standard account using the admin name and password. On my own computer I use OSX 10.6.8 and have never noticed this kind of behaviour before when updating software. My son's computer is new so I tried reinstalling Lion but the same thing happened. Any ideas or suggestions?