Backing store issue in FC12

[vinod gullu]

 Dear All,
 
 I have installed FC12 64 bit on my  PC. When i am
 longing into remote PC and trying to open the graphics
 applications on remote PC, The window becomes black .
 
 I have put Option "Backingstore" "on" in my xorg.conf in
 Device section. 
 
  But now the moment I log into remoter M/C and launch the
 graphics application on remote M/C, The system logs out from
 remote as well as local M/C.
 
 Any diagnosis for this?
 
 Thanks in advance
 
 
 VINOD KUMAR GULERIA ADD/AERO VSSC, TRIVANDRUMKERLA- 695022
 0471-2564429,2564938(OFFICE)+91 9447109608 (RES)