After today's patch, when you turn auto-attack on, it does not show in your chat EDIT: Never mind, it's in melee warnings. Need to re-adjust the filters.
filters were moved around today. It may be in another tab or window. My auto attack messages work fine and are in main chat, but I send all to main chat, then parse out all non spam messages to other windows, so I am not the expert on what that message's default is.