bug#3273: 23.0.93; "M" getting bound as prefix key instead of meta?

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Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

I'm at a loss to explain this, but when I do `M-x remember', shift+M ends
up being used as a prefix key for a few commands:

  ...
  M -             Prefix Command

  <remap> <delete-backward-char>  org-delete-backward-char
  <remap> <delete-char>           org-delete-char
  <remap> <self-insert-command>   org-self-insert-command

  M-TAB           org-complete
  M-RET           org-insert-heading
  M-a             org-forward-sentence
  M-b             org-backward-sentence
  ...

For what it's worth, these changes in org.el have no apparent effect:

  -(define-key org-mode-map "\M-a" 'org-backward-sentence)
  -(define-key org-mode-map "\M-e" 'org-forward-sentence)
  +(define-key org-mode-map [(meta ?b)] 'org-backward-sentence)
  +(define-key org-mode-map [(meta ?a)] 'org-forward-sentence)

Any help you can offer much appreciated.  Thanks!

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In GNU Emacs 23.0.93.1 (i386-apple-darwin9.6.0, NS apple-appkit-949.43)
 of 2009-05-02 on black.local
Windowing system distributor `Apple', version 10.3.949
configured using `configure  '--with-ns''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Org

Minor modes in effect:
  org-remember-mode: t
  show-paren-mode: t
  server-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-M-r t M C-g C-g C-h b C-x C-p C-s C-q C-j M = - <backspace> 
<backspace> - C-s C-s C-s C-r C-r C-. C-. C-. C-. C-, 
C-x C-n M-x r g r e p <return> o r g - f o r w M-/ 
<return> * . e l <return> 2 <backspace> e l <tab> 3 
<tab> <M-backspace> <M-backspace> s r c / e l <tab> 
3 <tab> o <tab> <return> C-x C-p C-n C-n C-n C-n C-n 
C-n C-n C-p C-n C-p <return> C-e C-n C-n C-n C-n C-n 
C-n C-n C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-n C-n C-n C-n C-n C-n C-n C-n C-x C-p C-n C-n C-p 
C-p C-p C-n C-n C-n C-e C-p C-e C-, C-, C-, C-, C-, 
C-, C-p C-p C-n C-n C-n C-x C-b M-x r e p o r t - e 
m <tab> <return>

Recent messages:
Loading /Users/dave/elisp/autoload.d/org-agenda-setup...done
Select template: [t] [n]
Use C-c C-c to remember the data.
Quit
Type C-x 4 C-o RET to restore the other window, C-M-v to scroll help.
Mark saved where search started
Scanning for dabbrevs...99%
Grep finished (matches found)
Mark set
Loading vc-git...done

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com