after upgrade to redhat 7.2, X don't start, console ownership problem

[Dumas Patrice <dumas centre-cired fr>]

Hi,

I have just upgraded my redhat box from a 7.0 (with lots of 7.1 and 7.2 rpm) to
7.2. I start X from the console using startx. I did it without problem just one
time. Now I can only start X as root. As a user, I get:

Fatal server error:
PAM authentication failed, cannot start X server.
        Perhaps you do not have console ownership?

I searched a bit on the web and I found my problem risen a lot of times, but I
haven't found a solution. I also posted this question on other mailing lists
(redhat-list and xfree86-list hosted by redhat) but I haven't have any solution
yet.

/dev/console is in mode 600 owned by root
/var/run/console.lock is present in mode 600 owned by root
/var/run/console contains a file with name the name of the user currently
logged, owned by root with perms 600

the /etc/security/console.perms, /etc/pam.d/xserver are correct, and there is
nobody logged in when the user log in.

Any idea ?

Pat