[K12OSN] Nautilus can't be used now, due to an unexpected error

[Hung Phan]

Ran into many issues with K12LTSP v6 :(
Have anyone able to get K12LTSP runs trouble-free with default settings?
The latest issue we have is: Nautilus can't be used now, due to an  
unexpected error.
More details: Nautilus can't be used now, due to an unexpected error  
from Bonobo when attempting to locate the factory. Killing Bonobo- 
activation-server and restarting Nautilus may help fix the problem.

We kill bonobo processes, nautilus processes, and pam-panel.icon,  
still not able to login to user account without the screen disappear  
on us.
All screens just flash and disappear.

Thank you very much,