Can't add or change custom images of address book entries Sometimes I'm not able to change any of the custom images associated with contacts in the address book. If I quit and restart several times, it eventually works again. 

What would cause this sort of thing to happen? I'm running on Snow Leopard.
Type in terminal:

chmod -R 777 /private/var/mobile/Library/AddressBook

chown -R mobile /private/var/mobile/Library/AddressBook

It worked for me

from: http://www.hackint0sh.org/f126/33674.htm