After updated from 13.04 to 13.10, I get graphical errors when the launcher autohides:
My problem is the brown bar in left side of screen, show in the pictures.
If I right click the bar, the portion below the context menu disappears and is redrawn after a few seconds. I cannot make a screenshot of that, when I press PrtScr the bar is always redrawn.
I think this is launcher's background which is not removed when the launcher is hidden.
I try run
dconf reset -f /org/compiz/ - without effect.
When I disable launcher auto-hiding everything works well.
[SeatDefaults] user-session=ubuntu greeter-session=unity-greeter
The problem was that the system was not set to the correct graphics driver. I had the "VESA" instead of "Intel driver." And 3D graphics acceleration is not working. After installing the driver intel, graphic bug disappeared.