gdm question about locale setting

[Shi-Ming Chen]

My gdm seems not to remember my last language (locale) setting. Since I 
select my locale and press the button "Make Default", the next time when 
    I login, my locale become "en_US.UTF-8" (this is my system default).
This annoys me because it stops me from using the automatic login feature.

The problem was not appeared until I updated something, but I can't 
remember what it is.
Dose anyone know how to let gdm remember my last locale setting?

(My .dmrc contains
	[Desktop]
	Session=default
	Language=zh_TW.Big5
)

--
Shi-Ming Chen
from Taiwan