I had the same problem when I downloaded the update from Apple several days ago. Only Safari just refused to work. So I got rid of the 4.1.2 version and tried to use an older version to get up and going again. Older versions will not install because there is a "newer" version of Safari somewhere on the computer, but damned if I can find it. If anyone has any ideas I'd appreciate it, as I'm sure Curiosity would.