You should never login to GUI as root. Never as in not ever.
Okay. Out of curiosity, why not?
If you want to test your theory as more general, create a new user and log in as that user (you can delete the user and his files/home directory easily, later).
I'd like to try this, but for some reason, I can't get a new user going. I create the user like this:
[root@localhost ~]# adduser -ppassword -m roger
But when I try to log in at the GUI prompt to get into Gnome, it always password incorrect. Am I creating the user wrong?
Dave