I've been happily chugging along with Ubuntu 14.04 (love it), and something I must have done removed the on screen notification when I change the volume via keyboard buttons. When I change the volume via the keyboard, it works, I can hear the alert telling me I've done it, and the small volume indicator in the panel does show the change, but I used to see a pop up rounded rectangle in the top right of the screen that showed me clearer feedback when I changed volume via the keyboard. It's now gone. Can anyone offer any help in bringing it back?