Hi, I have problem with permissions.
Let's start by saying I've done the repair permissions through disk utility. That will work, until apps crash.
However, sometimes Mail will crash, Notes will crash. When I start them back up, I get a note that says I need to log back into iMessage. I do that, then get all the warnings on all my iDevices.
Then - trying to copy anything - I get a message that says I do not have permission.
Rinse & repeat - with a restart too.
Each time those apps crash, so go the permissions. I'm not sure which is the chicken, which is the egg.