Since AUCTeX installation, Gnus won't post on any Usenet group

[Merciadri Luca]

Hi,

Some days ago, I posted 
http://groups.google.com/group/gnu.emacs.gnus/browse_thread/thread/c401c22ab28b582c.
Actually, my Gnus was showing `Denied posting -- empty article' ,
something it had never shown before when posting. Posting on Usenet
was then a random action, and it sometimes worked, and sometimes not.
Now, my Gnus never accepts posting something on Usenet. Before these
problems, my Gnus always accepted posting whatever on Usenet. Its
behaviour was irreproachable.

The only thing I have changed in my whole Emacs & Gnus config. is that
I installed, some days ago, AUCTeX. Everything went right, and, even
the installation's day, Gnus accepted to send articles on Usenet. Now,
it won't do anything like that. Why? I changed nothing.

Here is what I appended to my .emacs after having installed AUCTeX
with preview-latex. (I have also tried by removing these lines from
the .emacs, which does not change Gnus' behaviour.)

==
(setq load-path (cons "~/auctex-11.86/" load-path))
(setq load-path (cons "~/auctex-11.86/preview/" load-path))

(load "~/auctex-11.86/auctex.el" nil t t)
(load "~/auctex-11.86/preview/preview-latex.el" nil t t)
==

Thanks.