"I tried this but unfortunately it does not help with my set-up."
If your really desperate for a workaround, you'll have to give up Unity 3D (Unity is a compiz plugin). Unity 2D and GNOME Classic replace Compiz with Metacity, and if you install GNOME 3 PPA you'll get Mutter, but compiz won't be running (or crashing). Something to think about ;).
"I tried this but unfortunately it does not help with my set-up."
If your really desperate for a workaround, you'll have to give up Unity 3D (Unity is a compiz plugin). Unity 2D and GNOME Classic replace Compiz with Metacity, and if you install GNOME 3 PPA you'll get Mutter, but compiz won't be running (or crashing). Something to think about ;).