What is more, and IMO it is compiz-related as well, turning plugins on and off a few times make Compiz crash, and the only way to make system usable again is to switch to console (Ctrl+Alt+F1) and restart LightDM from there (Alt+F2 does not work, so I can't open terminal and use compiz --replace).
What is more, and IMO it is compiz-related as well, turning plugins on and off a few times make Compiz crash, and the only way to make system usable again is to switch to console (Ctrl+Alt+F1) and restart LightDM from there (Alt+F2 does not work, so I can't open terminal and use compiz --replace).