Description of problem:
During Testing bug #252178, while run dual-head (bug exist for one monitor also) and run command:
kdesktop_lock --forcelock

it lock the both desktop, but after 60 sec, it unlock the both screen for few sec with following message:

--------
[root@dhcp6-144 ~]# kdesktop_lock.bin  --forcelock
X Error: BadAccess (attempt to access private resource denied) 10
  Major opcode:  2
  Minor opcode:  0
  Resource id:  0x260000e
Killed
--------

Version-Release number of selected component (if applicable):
kdebase-3.5.4-19.el5

How reproducible:
Everytime during using dual head

Steps to Reproduce:
1. USE bugzilla #252178
2. run command (kdesktop_lock --forcelock)
3. wait for ~60 sec
  
Actual results:
Both screen unlocked

Expected results:
those should not happen

Additional info:
bug exist for one monitor also