Hi, Thanks for Making and Maintaining XEmacs !!!
In XEmacs 21.2  (beta33) "Melpomene" [Lucid] (i686-pc-linux) of Sat May 27 2000
on ark
configured using `configure --prefix=/usr/local/src/xemacs-21 --verbose'
Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:
Systematic crash when doing
   C-M Right-Button
to get buffers-popup-menu and RELEASING THE BUTTON OUTSIDE THE MENU.
happens also without .emacs file
  xemacs -q
=======================================
Lisp backtrace follows:
  # (condition-case ... . error)
  # (catch top-level ...)
===========  Stacktrace  ==============
 gdb /usr/local/bin/xemacs core 
(gdb) where
#0  0x403dac11 in __kill () from /lib/libc.so.6
#1  0x80b4574 in fatal_error_signal (sig=6) at emacs.c:293
#2  0x403dab18 in __restore () at ../sysdeps/unix/sysv/linux/i386/sigaction.c:125
#3  0x403dc053 in abort () at ../sysdeps/generic/abort.c:88
#4  0x80b44b5 in assert_failed (file=0x8200ec6 "lisp.h", line=589, 
    expr=0x8200ea0 "RECORD_TYPEP (obj, lrecord_type_cons)") at emacs.c:2754
#5  0x80d8e54 in popup_selection_callback (widget=0x85d6dc8, ignored_id=65545, 
    client_data=0xffffffff) at lisp.h:589
#6  0x80d523f in popup_menu_down_callback (widget=0x85d6dc8, id=65545, client_data=0x0)
    at menubar-x.c:664
#7  0x81d4add in pick_hook (w=0x85d6dc8, client_data=0x856fd18, call_data=0x8568b90)
    at lwlib-Xlw.c:113
#8  0x401dc104 in XtCallCallbackList () from /usr/X11R6/lib/libXt.so.6
#9  0x81d36fe in Select (w=0x85d6dc8, ev=0xbffff1a8, params=0x0, num_params=0x402182d4)
    at xlwmenu.c:3395
#10 0x4020a9dd in HandleActions () from /usr/X11R6/lib/libXt.so.6
#11 0x4020aec9 in HandleSimpleState () from /usr/X11R6/lib/libXt.so.6
#12 0x4020b411 in _XtTranslateEvent () from /usr/X11R6/lib/libXt.so.6
#13 0x401e72bf in XtDispatchEventToWidget () from /usr/X11R6/lib/libXt.so.6
#14 0x401e7cfd in _XtDefaultDispatcher () from /usr/X11R6/lib/libXt.so.6
#15 0x401e7f75 in XtDispatchEvent () from /usr/X11R6/lib/libXt.so.6
#16 0x401f2ca5 in XtAppProcessEvent () from /usr/X11R6/lib/libXt.so.6
#17 0x81a4d9e in emacs_Xt_next_event (emacs_event=0x853001c) at event-Xt.c:2592
#18 0x80e9d7d in event_stream_next_event (event=0x853001c) at event-stream.c:508
#19 0x80eb9e0 in next_event_internal (target_event=139657244, allow_queued=1) at
event-stream.c:1967
#20 0x80ebfcf in Fnext_event (event=139657244, prompt=136880404) at event-stream.c:2181
#21 0x809a9af in Fcommand_loop_1 () at cmdloop.c:566
#22 0x809ac5e in command_loop_1 (dummy=136880404) at cmdloop.c:490
#23 0x80bf0c6 in condition_case_1 (handlers=136880500, bfun=0x809ac24
<command_loop_1>, 
    barg=136880404, hfun=0x809acd0 <cmd_error>, harg=136880404) at eval.c:1644
#24 0x809adc7 in command_loop_2 (dummy=136880404) at cmdloop.c:252
#25 0x80bef8c in internal_catch (tag=136952164, func=0x809ad8c <command_loop_2>,
arg=136880404, 
    threw=0x0) at eval.c:1310
#26 0x809a2da in initial_command_loop (load_me=136880404) at cmdloop.c:301
#27 0x80b27f5 in xemacs_21_2_b33_i686_pc_linux (argc=2, argv=0xbffff784, envp=0xbffff790,
restart=0)
    at emacs.c:1873
#28 0x80b478f in main (argc=2, argv=0xbffff784, envp=0xbffff790) at emacs.c:2292
#29 0x403d4313 in __libc_start_main (main=0x80b4690 <main>, argc=2, argv=0xbffff784,
    init=0x807e36c <_init>, fini=0x81e3390 <_fini>, rtld_fini=0x4000ac70
<_dl_fini>, 
    stack_end=0xbffff77c) at ../sysdeps/generic/libc-start.c:90
(gdb) 
==============  M-x describe-installation   ============================
uname -a: Linux ark 2.2.14 #6 Tue Feb 8 20:09:33 CET 2000 i686 unknown
./configure  '--prefix=/usr/local/src/xemacs-21' '--verbose'
XEmacs 21.2-b33 "Melpomene" configured for `i686-pc-linux'.
Compilation / Installation:
  Source code location:              /usr/local/src/xemacs-21/src/xemacs-21.2-b33
  Installation prefix:               /usr/local/src/xemacs-21
  Operating system description file: `s/linux.h'
  Machine description file:          `m/intel386.h'
  Compiler:                          gcc -g -O3 -Wall -Wno-switch -Wpointer-arith -Winline
-Wmissing-prototypes -Wshadow
  Relocating allocator for buffers:  no
  GNU version of malloc:             yes
    - Using Doug Lea's new malloc from the GNU C Library.
Window System:
  Compiling in support for the X window system:
    - X Windows headers location:                 /usr/X11/include
    - X Windows libraries location:               /usr/X11/lib
    - Handling WM_COMMAND properly.
  Compiling in support for the Athena widget set:
    - Athena headers location:                    X11/Xaw
    - Athena library to link:                     Xaw
  Using Lucid menubars.
  Using Lucid scrollbars.
  Using Motif dialog boxes.
  Using Motif native widgets.
TTY:
  Compiling in support for ncurses.
  Compiling in support for GPM (General Purpose Mouse).
Images:
  Compiling in support for GIF  images (builtin).
  Compiling in support for XPM  images.
  Compiling in support for PNG  images.
  Compiling in support for TIFF images.
Sound:
  Compiling in support for sound (native).
  Compiling in support for ESD (Enlightened Sound Daemon).
Databases:
  Compiling in support for Berkeley database.
  Compiling in support for GNU DBM.
  Compiling in support for LDAP.
Internationalization:
Mail:
  Compiling in support for "dot-locking" mail spool file locking method.
Other Features:
  Compiling in support for dynamic shared object modules.
  Clash detection will use "${statedir}/${inststaticdir}/lock" for locking
files.
  Compiling in support for extra debugging code.
  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: ---------------------------------------------------------
=============================================== (other XEmacs instance)
Recent keystrokes:
button1up RET right right right right right right right 
right right right right right right right right right 
right right right right left RET DEL DEL DEL end . 
RET RET W o r k s SPC e BS BS BS BS BS BS BS BS t e 
s t e d SPC w i t h SPC button2 button2up left left 
left C-DEL left left left left left left left left 
left BS RET SPC SPC down RET m o r e SPC i n f o r 
m a t i o n : RET button1 button1up misc-user
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