XFCE lock screen on lid closing

[Andrea Venturoli]

Hello.

I've got yet another XFCE question...

Until a little time ago, when I closed the lid of my laptop xscreensaver 
would start and a password prompt appeared when I reopened it.
Now, I don't know after what upgrade, nothing happens.

In Settings/Power Manager/General I have/"When sleep button is pressed": 
either "Nothing" or "Ask".
Ask brings me the "Log Out"/"Restart"/"Shutdown prompt".

Any hint?

  bye & Thanks
	Andrea Venturoli