can not start kdesktop_lock

Hi!

I have kde 3.5.5 (testing). I'm experiencing a weird
problem. When 
clicking on the Desktop Lock button on the Lock/Logout
applet, or 
pressing the hotkey associated with "Lock
Session", then sometimes 
kdesktop_lock won't start. I need to press the button three
or four 
times to get it started. I have no error entry in my
~/.xsession-errors 
and have no idea how to debug this :

I've tried to replace the kdesktop_lock binary with a script
which calls 
strace with kdesktop_lock, but it says:
strace: ptrace(PTRACE_TRACEME, ...): Operation not permitted

Any ideas would be appreciated.

Thanks!

ps.: please cc me

Daniel
-- 
LeVA


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