Just had a really strange error when I turned booted into Lion - something about the system clock being set pre Jan 2008 which can cause programs to behave "erratically". I selected ok whatever and the clock was spot on, not pre 2008 at all? I googled the problem and there were a bunch of answers about repairing disk permissions. So I did and there were about 10 entries that needed "fixing". I did a full reinstall a week ago....? Is this normal? Is repairing permissions something that should be done regularly? How often do you do it?