I'm trying to use windows key + tab to switch tab like alt + tab under windows 8. It was working just a couple of days ago and now it stopped working for some unknown reason. As far as I know nothing has changed. I know the windows key itself isn't broken
because pressing it by itself will bring me to metro, and again back to desktop. All the other windows key combination works, like windows key + I, +D, +R whatever, everything besides tab.