I received a strong warning from an experienced Mac friend in Salzburg , Austria to NOT download Security Update 2007-009 for OSX 10.4.11 after his OSX 10.4.11 system experienced web-based malfunctions concerning password ( at his personal banking log-in site) that took place shortly after the update had been made. Would appreciate your comments re this happening when you know/learn something about it....Thanks, Frank Ettenberg >