Constant reverting of dired buffer

[Peter Lee]

I have the following in my .emacs related to dired-x.

(global-set-key (kbd "C-x C-j") 'dired-jump)
(global-set-key (kbd "C-x 4 C-j") 'dired-jump-other-window)

(add-hook 'dired-load-hook
          (lambda ()
            (load "dired-x")
            ;; Set dired-x global variables here.  For example:
            ;; (setq dired-guess-shell-gnutar "gtar")
            ;; (setq dired-x-hands-off-my-keys nil)
            ))
(add-hook 'dired-mode-hook
          (lambda ()
            ;; Set dired-x buffer-local variables here.  For example:
            ;; (setq dired-omit-files-p t)
            ))

If I uncomment the (setq dired-omit-files-p t) line (which is what I'd
like to do), when I go into dired it constantly reverts the buffer
which makes navigation painful, and an eye-sore with jit font locking.

To get around this, I decided to just manually omit files each time I
enter a dired buffer.  I hit M-o to omit, and it omits, then a few
seconds later it reverts to the full listing.

Am I missing something from my config?  Or is this a known issue with
the version included in cvs emacs?

Thanks.

Emacs  : GNU Emacs 21.3.50.1 (i386-msvc-nt5.1.2600)
 of 2004-02-16 on PONGMASTER
Package: dired-x

current state:
==============
(setq
 dired-bind-vm nil
 dired-vm-read-only-folders nil
 dired-bind-jump t
 dired-bind-info t
 dired-bind-man t
 dired-find-subdir nil
 dired-enable-local-variables t
 dired-local-variables-file ".dired"
 dired-guess-shell-gnutar nil
 dired-guess-shell-gzip-quiet t
 dired-guess-shell-znew-switches nil
 dired-guess-shell-alist-user nil
 dired-clean-up-buffers-too t
 dired-omit-files-p nil
 dired-omit-files "^\\.?#\\|^\\.$\\|^\\.\\.$"
 dired-omit-extensions '("CVS/" "~" ".o" ".bin" ".bak" ".obj" ".map" ".a" ".ln" 
".blg" ".bbl" ".elc" ".lof" ".glo" ".idx" ".lot" ".dvi"
                         ".fmt" ".tfm" ".pdf" ".class" ".fas" ".lib" ".x86f" 
".sparcf" ".lo" ".la" ".toc" ".log" ".aux" ".cp" ".fn"
                         ".ky" ".pg" ".tp" ".vr" ".cps" ".fns" ".kys" ".pgs" 
".tps" ".vrs" ".idx" ".lof" ".lot" ".glo" ".blg" ".bbl"
                         ".cp" ".cps" ".fn" ".fns" ".ky" ".kys" ".pg" ".pgs" 
".tp" ".tps" ".vr" ".vrs")
 )