From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020625
Description of problem:
Try to lock the screen by MainMenu->Lock screen, but nothing happens.
Windows on the desktop remain active.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Actual Results: Screen remains unlocked
Expected Results: Screen becomes locked
What version of control-center do you have installed?
Did you connect as root ?
If so, this is a normal behaviour of xscreensaver...
And because xlockmore is not part of limbo you cannot lock the X screen when
connected as root.
A workaround :
So you can go to a normal console, connect and launch vlock -a.
Indeed, I connected as root. vlocks helped. Thanks a lot.