I needed a bigger HDD and so decided to upgrade to SL at the same time; install went smoothly, ran 'Verify Disk Permissions' in Disk Utility, all fine, ran updates including Java update, and now Disk Utility is showing Permissions differ on "System/Library/Jave/JavaVirtualMachine/1.6.0.jdk/Contents/..." I assume that I can ignore these? And why do these permissions only show once the updates have been installed? In addition, the trackpad seems very sensitive after the SL install, when moving the cursor around a web page on Safari, a selection will randomly be highlighted or a weblink will be activated even when I haven't clicked it! (I have my trackpad settings on 'tap to click'). If anyone have any comments or solutions on any/all of the above would be much appreciated. *EDIT* I think I may have resolved the trackpad issue by disabling the Three Fingers swipe to navigate option.