After installing some updates, I have had the following problems. itunes and ichat keep reverting back to their original settings whenever I restart the computer. The settings page/instructions pops up and itunes tells me that the library was damaged. It all started after I installed the updates, I'm afraid I don't remember which ones. My keychain also seems damaged as every single time I start safari it tells me that the "keychain login cannot be found to store safari." After I reset to defaults, it happens again and again. How can I fix this? Thanks.