I'm used to [alt]+[tab] to change windows and I've installed Compiz Config Settings Manager (CCSM) to tweak the default behaviour to my likings.
I've noticed that, after pressing [alt]+[tab], you can only go forward (press [tab] again). You cannot go backward (pressing [shift]+[tab], maintaining [alt]). This means that, when you pass the window you want to use, you have to go full circle.
Is there a way to tweak the switcher to do that? I believe that this was how it used to work in 11.10.