S-SPC is not being processed correctly when running Emacs -Q (version 24.2 on Mac OS X 10.7.5 next step, installed via homebrew --cocoa --srgb). Specifically, the shift modifier is being dropped/ignored. For example, doing (read-event) followed by S-SPC returns 32, whereas with other modifiers of SPC it does the correct thing. S-SPC does not appear to be being caught and translated by any of the intervening translation maps and the current-input-method is nil. Also, emacs 23.2 handles S-SPC properly on the same machine, so the key sequence does not appear to have been affected by the OS. This is an issue for me because I use that sequence in several modes, including icicles. Thanks for your help. If Emacs crashed, and you have the Emacs process in the gdb debugger, please include the output from the following gdb commands: `bt full' and `xbacktrace'. For information about debugging Emacs, please read the file /usr/local/Cellar/emacs/24.2/share/emacs/24.2/etc/DEBUG. In GNU Emacs 24.2.1 (x86_64-apple-darwin11.4.2, NS apple-appkit-1138.51) of 2013-02-08 on Christophers-MacBook-Pro.local Windowing system distributor `Apple', version 10.3.1138 Configured using: `configure '--prefix=/usr/local/Cellar/emacs/24.2' '--without-dbus' '--enable-locallisppath=/usr/local/share/emacs/site-lisp' '--infodir=/usr/local/Cellar/emacs/24.2/share/info/emacs' '--with-ns' '--disable-ns-self-contained' 'CC=cc'' 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: en_US.UTF-8 value of $XMODIFIERS: nil locale-coding-system: utf-8-unix default enable-multibyte-characters: t Major mode: Lisp Interaction Minor modes in effect: tooltip-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Recent input: s-: C-g : ( r e a d - e v e n t ) C-a C-x SPC C-g C-g C-x C-g C-h c e C-h c C-x C-e C-j C-g C-p C-e C-h c C-j C-g C-j SPC C-p C-p C-e C-j C-SPC C-p C-p C-e C-a C-o C-y C-j C-n C-e C-j M-SPC C-p C-p C-e C-j SPC C-p C-p C-e C-j SPC C-h f b r e p o r - e m Recent messages: Quit e runs the command self-insert-command C-M-x (translated from C-x) runs the command eval-defun Quit C-j runs the command eval-print-last-sexp Quit Mark set Making completion list... Type C-x 1 to delete the help window. Load-path shadows: None found. Features: (shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail regexp-opt rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils help-mode easymenu view help-fns ispell time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel ns-win tool-bar dnd fontset image fringe lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces cus-face files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process ns multi-tty emacs)