Any time I try logging in to FaceTime and iMessage, I get an error: "An error occurred during activation. Please try again later." I've heard of this problem before, and the only solution seems to be creating an entirely new user account. However, if I migrate my old account from a Time Machine backup, the problem carries through to the new account. I can't copy files in my Home folder from the old account to the new account without running into a ton of permission issues, and I'm not entirely sure what all I *need* to backup from my home/Library folder other than a few specific folders in Application Support. (I tried this yesterday and changing a mass amount of folder permissions is a real pain and takes forever – not to mention, if you copy stuff from your old Library folder, it causes the "OS X needs to repair your library" error constantly.) Any suggestions? It seems like since the error doesn't persist on a new user account, but does persist when migrating data, the issue is somewhere in my home/Library folder and should be fixable by deleting files or something. But so far, I've not found any helpful suggestions on what those files might be.