shift-space registers as space under Mac OS X

[Bill Rising]

I use S-SPC as a prefix key when in ultra-tex-mode. It works fine when
using the binary built as:
GNU Emacs 22.0.50.1 (powerpc-apple-darwin8.0.0)
 of 2005-04-28 on ludwig.
It inserts a space (and fails as a prefix) when using the binary  
built as:
GNU Emacs 22.0.50.1 (powerpc-apple-darwin7.9.0)
 of 2006-09-03 on rodrigues.inf.ed.ac.uk

If I type C-h k S-SPC in the old build, the help starts with
 SPC (translated from S-SPC) ...
If I type the same sequence in the nightly build, the help starts with
 SPC...
without any mention of a translation

Both of these were done using the U.S. input method in Mac OS X 10.4.7.


In GNU Emacs 22.0.50.1 (powerpc-apple-darwin7.9.0)
 of 2006-09-03 on rodrigues.inf.ed.ac.uk
X server distributor `Apple Computers', version 10.4.7
configured using `configure '--without-x' '--prefix=/usr/local''

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
  locale-coding-system: iso-8859-1
  default-enable-multibyte-characters: t

Major mode: Info

Minor modes in effect:
  encoded-kbd-mode: t
  display-time-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
s u <tab> m <backspace> <backspace> e n d <tab> <backspace>
<backspace> <backspace> <backspace> <backspace> <backspace>
<backspace> <backspace> b <backspace> <backspace> b
u <tab> <help-echo> <help-echo> <help-echo> C-h i m
e m <return> m b u g <tab> s <return> C-x 1 <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> C-h C-e <C-down>
<C-down> <next> <next> <next> <next> <next> <next>
<next> <next> <next> b C-x k <return> <return> <next>
u <down> <down> <up> <return> SPC u <down> <return>
M-x r e p o r <tab> <return>

Recent messages:
Making completion list...
Note: file is write protected
Fill column set to 75 (was 70)
Loading outline...
Loading easy-mmode...done
Loading outline...done
Fill column set to 75 (was 70)
View mode: type C-h for help, h for commands, q to quit.
Buffer is read-only: #<buffer PROBLEMS>
Loading emacsbug...done

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