I've seen this with Chrome and Firefox fullscreen windows (usually YouTube).
I've seen this on stock Ubuntu GNOME 15.04 (gnome-shell 3.14), and also with the gnome3-staging PPA (gnome-shell 3.16).
I've seen this with Chrome and Firefox fullscreen windows (usually YouTube).
I've seen this on stock Ubuntu GNOME 15.04 (gnome-shell 3.14), and also with the gnome3-staging PPA (gnome-shell 3.16).