Hi, I've just run into a very peculiar problem. I have a MacBook Pro 2GHz Intel Core i7. A few minutes ago I ran Software Update, now I'm on OS 10.6.7. Not entirely sure which version of 10.6 I had before. I have a habit of keeping my Applications folder organised by putting applications into different subfolders. Until now Software Update annoyingly dropped updated applications in the main application folder, but I could just swap them with the old ones. Now what happened this time is that most of the updated apps appeared with a generic application icon and several crucial ones are not working. Apps without icon are: Address Book, App Store, Dashboard, FaceTime, Front Row, iCal, Mail, Time Machine. I don't use all of them but Address Book, Mail and iCal are not working or behaving erratically, and they are crucial for me. The old version of Mail wouldn't open any more either, it is incompatible with this system. Is there any way I could fix this save for a complete reinstall? Thanks for any help.