Comment 10 for bug 1362555

It's a theme bug. on a 14.10 fresh install, xfce4-notifyd is using /usr/share/themes/Lubuntu-default/gtk-2.0/images/panel-bg.png for background, and it tiles the image to fill the box
On my 14.04, there no panel-bg.png, so the notification box is plain. So as a workaround, i deleted this file. I've lost the shading of the panel, but the notifications are much more readable.