I've got an irritating problem, and I can't find a fix for it. At one point, I could type in the name of an Address Book group in the TO:, CC:, or BCC: field in Mail.app, and it would explode with the addresses of everyone in that group. Since upgrading to Mavericks, that doesn't happen. Anyone else noticed this? Is there a solution, or is this a user error? Thanks for any help!