Ok, I spoke too quickly. I tried again, and the core dumps happens without reference to any package. It actually happens whenever I put the mouse over the toolbar (but nowhere else). Here is exactly what I did. 1. tar -xzf xemacs-21.0.60.tar.gz 2. tar -xzf xemacs-21.0.60-elc.tar.gz 3. ./configure 4. cd src 5. ./xemacs -vanilla then the first time the mouse hits the toolbar, it cores and I get the following lisp backtrace. -- Richard Coleman coleman(a)math.gatech.edu Fatal error: assertion failed, file window.h, line 245, RECORD_TYPEP (_obj, lrecord_window) || MARKED_RECORD_P (_obj) 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 /home/rcoleman/xemacs/xemacs-21.0.60/src/xemacs 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: redisplay-echo-area() # bind (inhibit-read-only zmacs-region-stays stdout-p frame message) raw-append-message("Paste from clipboard" #<x-frame "emacs" 0x8fd> nil) # bind (stdout-p frame message label) append-message(help-echo "Paste from clipboard" nil nil) # bind (stdout-p frame message label) display-message(help-echo "Paste from clipboard") # bind (mess) show-help-echo("Paste from clipboard") # bind (hstring pointer vars help button user-pointer user-pointer1 glyph-extent glyph-extent1 extent point modeline-string modeline-point buffer window frame event) default-mouse-motion-handler(#<motion-event 244, -3>) next-command-event() byte-code("..." [add-timeout startup-message-timeout #<compiled-function (ignore) "...(5)" [nil ... ...] 3> nil timeout startup-splash-frame sit-for 0 next-command-event unread-command-event] 4) # (catch timeout ...) # (unwind-protect ...) # bind (timeout) command-line-1() # bind (command-line-args-left) command-line() # (unwind-protect ...) normal-top-level() # (condition-case ... . error) # (catch top-level ...) uname -a: FreeBSD phaedrus.cmb.net 2.2.6-RELEASE FreeBSD 2.2.6-RELEASE #0: Wed Mar 25 02:28:49 GMT 1998 jkh＠time.cdrom.com:/usr/src/sys/compile/GENERIC i386 ./configure XEmacs 21.0-b60 "Poitou60" configured for `i386-unknown-freebsd2.2.6'. Where should the build process find the source code? /home/rcoleman/xemacs/xemacs-21.0.60 What installation prefix should install use? /usr/local What operating system and machine description files should XEmacs use? `s/freebsd.h' and `m/intel386.h' What compiler should XEmacs be built with? gcc -g -O3 -Wall -Wno-switch Should XEmacs use the GNU version of malloc? yes Should XEmacs use the relocating allocator for buffers? yes What window system should XEmacs use? x11 Where do we find X Windows header files? /usr/X11R6/include Where do we find X Windows libraries? /usr/X11R6/lib Compiling in support for XAUTH. Compiling in support for XPM images. -------------------------------------------------------------------- WARNING: Compiling without PNG image support. WARNING: You should strongly consider installing the PNG libraries. WARNING: Otherwise certain images and glyphs may not display. WARNING: (a copy may be found in ftp://ftp.xemacs.org/pub/xemacs/aux) -------------------------------------------------------------------- Compiling in support for (builtin) GIF image handling. Compiling in native sound support. Compiling in support for Berkeley DB. Compiling in support for GNU DBM. Compiling in support for proper session-management. Using Lucid menubars. Using Lucid scrollbars. Using Athena dialog boxes. Compiling in DLL support. movemail will use "flock" for locking mail spool files. Compiling in extra code for debugging. Compiling in code for checking XEmacs memory usage. WARNING: --------------------------------------------------------- WARNING: Compiling in support for runtime error checking. WARNING: XEmacs will run noticeably more slowly as a result. WARNING: Error checking is on by default for XEmacs beta releases. WARNING: ---------------------------------------------------------