I have recently upgraded Ubuntu from 13.04 to 14.04. Soon I have noticed that the most commonly used short cut, Alt+Tab, had changed its meaning. It switches now only between the current and the previous application. Pressing Tab more times does not have any effect.
I have discovered that super+Tab behaves like old Alt+Tab. I tried to change short cuts, but all changes seem to be completely ignored(!).
How can I repair Alt+Tab to work as previously?