My MBP SR 2.2 did not connect to my Linksys WRT54G router on today's login. I have already logged in dozens of times since Monday's upgrade without a wireless issue. Under airport I saw my network listed with a lock. Selected it - and was told that a WEP password was required. That's so strange. Is Leopard supposed to dump your saved Keychains occasionally Also when I upgraded my wives MBP to 10.5.2 it did not connect on the first restart - but all I had to do was find the secured network and click on it - and it remembered the password.