I also have this problem, and know how to recreate it under 12.04 + Gnome Classic.
The bottom taskbar colours are wrong, but if you repeatedly minimise / restore a window, they eventually sort themselves out.
But on the next click, the colours go wrong again.
Hope that helps ...
I also have this problem, and know how to recreate it under 12.04 + Gnome Classic.
The bottom taskbar colours are wrong, but if you repeatedly minimise / restore a window, they eventually sort themselves out.
But on the next click, the colours go wrong again.
Hope that helps ...