I can't get them to work! Like when I change the default Forward Button to Switch Tabs on Safari (or Firefox or even when I'm on XP Pro/IE) or changing the One-Touch Searh button to bring up Finder. I've contacted Logitech and didn't have any luck. We both agree that my MX might be defective and they are sending me new one. Anyone use Logitech's MX Revolution Mice and does the Customized, using Keystroke work? Thanks.