iTunes Keyboard Inputs don't work after SO update

Hi,

After the SO update, performed last Friday, now keyboard inputs (back, pause, play, forward) no longer work when iTunes is playing music.

I have tried turning off and on iTunes and it did not solve. I tried restarting the MacBook Air, but it did not solve.

This issue is happening on my MacBook Air (13-inch, Mid 2012).

Have you got any advice?

Thanks,

Federico