Bug:
As the name states, when an AOE spell is being cast, most specifically by the healer.(Haven't paid attention to the rest)
there is a tiny yellow bar that matches curser movement horizontally in the top left hand corner of the screen.
1.)Click AOE spell
2.)Move mouse around and pay attention to the top left hand corner of the screen
3.)As you move your mouse this way and that a tiny yellow bar will silde back n forth