I'm on Xubuntu 14.04. When I originally upgraded, I had the problem of both light locker and xscreensaver running simultaneously. After that was fixed, light locker has been running smoothly.

But, recently, I noticed my screen on after I was gone all day; it was on when I woke up the next morning; etc.

I tried changing settings, rebooting, looking for other screensaver-like processes, checking that the command args would update when I made changes in the settings UI, etc.

I can manually lock the screen with light-locker-command -l, but I don't remember to do that every time.

I wasn't able to find other askubuntu questions that address my situation.

Could there have been a problem with a recent update (I apply them appx. once/week)? Or, are there other things I should check?