[Orgmode] Can't make TODO dependencies work

[John Rakestraw]

Hi --

I'm eager to use the TODO dependencies feature, but I can't make it
work. In my usual set-up, I (think I) have it set up correctly. (C-h
C-v indicates that org-enforce-todo-dependencies is set to t.) However,
the dependency simply isn't enforced. Nor is the "ordered" dependency
enforced. 

I understand that it's likely a problem in my set-up, but I don't know
where to check. However, after hours (literally -- yes, I'm a slow
learner), I discovered what I hope is a clue to someone more
knowledgeable than I. Given this simple test file:

++++++++++++++++++++
#+ARCHIVE: archive_cndls.org::* Finished Tasks and Projects
#+SEQ_TODO: TODO STARTED  DELEGATED AGENDA WATCH READ APPT | DONE \
DEFERRED CANCELED WAITING MAYBE 
#+TAGS: Placeholder(p) ATProgram(A) FacProgramming(F) ULI(U)Grants(G)\
Consultations (C) Supervisions(S) Misc(M) Teaching(T) ExCo(E) 
#+STARTUP: lognotestate 
#+Category: CNDLS
#+ARCHIVE: archive_cndls.org::
#+LaTeX_CLASS: report
# Time-stamp: <2009-02-01 11:26:41 jrake>

* TODO Main task
  :PROPERTIES:
  :ORDERED: t
  :END:

** TODO Subtask 1

** TODO Subtask 2
+++++++++++++++++++++

Dependencies work in one instance (#2 below), but they don't work in
instances 1 and 3 -- 

      1. If I start emacs/org-mode with a minimal configuration and
         then open this file, dependencies still don't work.

      2. If I start emacs/org-mode with a minimal configuration, open
         this file, then delete the header line beginning "#+SEQ_TODO"
         and refresh the settings, dependencies work.

      3. If I start emacs/org-mode with my usual configuration,
         dependencies still don't work in this simple test file, even
         if I delete the SEQ_TODO line in its header.

I set up my TODO list in each file, and there's no general set-up for
these in my ordinary configuration. Any clues where else I should look?

Emacs 22.2.1, org 6.20i, Linux (Fedora 10)

Thanks --

John Rakestraw