Gunnar Evermann writes: Yep. OK, this is really strange now. I've moved my .vm out of the way. Now, xemacs -q M-: (require 'efs) M-x vm Find a message digest object and middle click it. If you don't (require 'efs), it doesn't break. Also, if I run the same setup (binary, lisp, config files) against an X-display it doesn't break. See below. Thanks for your interest, Phil Fatal error: assertion failed, file indent.c, line 577, elt >= 0 Fatal error (6). Your files have been auto-saved. Use `M-x recover-session' to recover them. Please report this bug by running the send-pr script included with XEmacs, or selecting `Send Bug Report' from the help menu. As a last resort send ordinary email to `crashes(a)xemacs.org&#39;. *MAKE SURE* to include the information in the command M-x describe-installation. If at all possible, *please* try to obtain a C stack backtrace; it will help us immensely in determining what went wrong. To do this, locate the core file that was produced as a result of this crash (it's usually called `core' and is located in the directory in which you started the editor, or maybe in your home directory), and type gdb /usr/local/bin/xemacs-21.0-b63.exe core then type `where' when the debugger prompt comes up. (If you don't have GDB on your system, you might have DBX, or XDB, or SDB. A similar procedure should work for all of these. Ask your system administrator if you need more help.) Lisp backtrace follows: original-scroll-up(nil) # (unwind-protect ...) # bind (current-buffer selected-window window-buffer direction lines window) scroll-window(#<window on "message from keep/10 Presentation" 0x4898> nil 1) # bind (lines) scroll-up(nil) # bind (scroll-in-place-replace-original) byte-code("..." [nil scroll-in-place-replace-original scroll-up] 2) # (unwind-protect ...) # (unwind-protect ...) # bind (next-screen-context-lines) byte-code("..." [0 next-screen-context-lines select-window w ((byte-code "ÀÂÀ!ˆ)À‡" ... 2)) nil] 2) # (condition-case ... . ((error t))) byte-code("..." [nil (byte-code "ÀÂ!ˆŠÄ‹ˆ*Ň" [0 next-screen-context-lines select-window w ... nil] 2) ((error t))] 3) # (unwind-protect ...) # (unwind-protect ...) # bind (w) vm-howl-if-eom() # (unwind-protect ...) # bind (vm-sbe-buffer) vm-show-current-message() # (unwind-protect ...) # bind (vm-sbe-buffer) vm-preview-current-message() # bind (full-startup did-read-index-file folder-buffer first-time totals-blurb preserve-auto-save-file) byte-code("..." [bufferp folder nil preserve-auto-save-file totals-blurb first-time folder-buffer did-read-index-file full-startup expand-file-name vm-primary-inbox vm-folder-directory file file-directory-p error "%s is a directory" vm-get-file-buffer default-directory t no-conversion coding-system-for-read enable-local-variables inhibit-local-variables message "Reading %s..." find-file-noselect item vm-folder-history "Reading %s... done" buffer-file-coding-system current-load-list vm-xemacs-mule-p get-coding-system no-conversion-unix no-conversion-dos no-conversion-mac binary buffer-modified-p omodified buffer-read-only ((set-buffer-modified-p omodified)) encode-coding-region set-buffer-file-coding-system decode-coding-region vm-check-for-killed-summary vm-check-for-killed-presentation 0 vm-messages-not-on-disk major-mode vm-mode buffer-file-name file-newer-than-file-p make-auto-save-file-name read-only default-value vm-folder-read-only buffer-disable-undo abbrev-mode auto-fill-mode vm-mode-internal vm-read-index-file-maybe vm-assimilate-new-messages vm-gobble-visible-header-variables vm-gobble-bookmark vm-gobble-pop-retrieved vm-gobble-summary vm-gobble-labels vm-start-itimers-if-needed this-command apply vm-goto-new-folder-frame-maybe (folder) (primary-folder folder) vm-summary-buffer vm-presentation-buffer buffer-to-display vm-display vm startup vm-raise-frame-at-startup vm-raise-frame vm-emit-totals-blurb vm-thoughtfully-select-message vm-update-summary-and-mode-line vm-toolbar-support-possible-p vm-use-toolbar "Initializing toolbar..." vm-toolbar-install-toolbar "Initializing toolbar... done" vm-toolbar-update-toolbar vm-use-menus vm-menu-support-possible-p vm-menu-install-visited-folders-menu vm-should-generate-summary vm-summarize vm-mutable-frames vm-frame-per-summary vm-mutable-windows switch-to-buffer vm-message-list vm-preview-current-message run-hooks vm-visit-folder-hook substitute-command-keys "Auto save file is newer; consider \\[recover-file]. FOLDER IS READ ONLY." throw done vm-auto-get-new-m ail vm-block-new-mail "Checking for new mail for %s..." buffer-name vm-get-spooled-mail vm-startup-message-displayed vm-display-startup-message input-pending-p] 7) # (catch done ...) # bind (read-only folder) ad-Orig-vm(#<buffer "message from keep/10"> nil) # bind (ad-return-value read-only folder) vm(#<buffer "message from keep/10"> nil) # bind (read-only) vm-mode() # (unwind-protect ...) # bind (vm-sbe-buffer layout) vm-mime-display-internal-message/rfc822(#<extent *(1388, 1459) H vm-mime-function vm-mime-layout balloon-help keymap local-map 0xa79d4b8 in buffer keep Presentation>) # (unwind-protect ...) # bind (layout) #<compiled-function (layout) "...(6)" [vm-mime-display-internal-message/rfc822 layout] 2>(#<extent *(1388, 1459) H vm-mime-function vm-mime-layout balloon-help keymap local-map 0xa79d4b8 in buffer keep Presentation>) # bind (e event) vm-mouse-popup-or-select(#<buttondown-event button2>) # bind (event) vm-mouse-button-2(#<buttondown-event button2>) # bind (command-debug-status) call-interactively(vm-mouse-button-2) # (condition-case ... . error) # (catch top-level ...)