Gnome 3 - Strange black areas inside windows
I'm facing a strange issue after upgrading from Ubuntu 13.10 to 14.04 (well, technically, it wasn't an upgrade, as the network upgrade failed and I had to do a clean install). On many application windows, there are black areas, sometimes taking up the entire background of the window, sometimes only portions of it. This issue occurs on all GTK+ and Window themes.
I'm using GNOME 3.12.2, running on an ATI Mobility Radeon HD 4570 graphics card.
Try running this in a terminal:
gsettings set com.canonical.desktop.interface scrollbar-mode normal