[CentOS] Strange error on login: $HOME/.dmrc?

Hi,

Since this morning, when I login, GDM gives me an error message on login 
(it's in french, so I try to translate roughly):

$HOME/.dmrc has been ignored, but it is responsible for saving sessions. 
It should not be writable for other users, and permissions should be 644.

Now I had a look at this ~/.dmrc, and permissions were rw-------. So I 
did a chmod 644 on it (rw-r--r--) and logged back out... but the problem 
still persists. I'm puzzled.

Any suggestions?

Cheers,

Niki