Ever since the upgrade to Leopard, Airport won't display all of the nearby wifi networks anymore. It will sometimes display all of them but sometimes not. It's very buggy. I have to restart to get it to detect again but even after that it's not guaranteed. Please tell me this is a common problem with an obvious solution. Anything but a fresh install. I didn't do it because I've got too many programs and too little time to install every one of them.