Hi, I've started using XEmacs 21.4.12 on RedHat Linux 8.0. It crashes often and often when I open a file, mouse drag, etc. There's no problem to run the same version of XEmacs on RHL 7.3. Here are configure options and a backtrace: --infodir=/usr/local/info/xemacs\ --with-site-lisp\ --package-path=/usr/local/lib/xemacs/site-packages::/usr/local/lib/xemacs/mule-packages::/usr/local/lib/xemacs/xemacs-packages\ --with-athena=3d\ --with-mule\ --with-xim=no\ --with-xfs\ --with-file-coding (gdb) run Starting program: /Work/xemacs-21.4.12/src/xemacs Fatal error: assertion failed, file xlwtabs.c, line 1997, *reply_width > 0 && *reply_height > 0 Program received signal SIGABRT, Aborted. 0x42028cc1 in kill () from /lib/i686/libc.so.6 (gdb) bt #0 0x42028cc1 in kill () from /lib/i686/libc.so.6 #1 0x42028ac8 in raise () from /lib/i686/libc.so.6 #2 0x4202a019 in abort () from /lib/i686/libc.so.6 #3 0x080b58be in assert_failed (file=0x6 <Address 0x6 out of bounds>, line=1108517584, expr=0x0) at emacs.c:3429 #4 0x081e9a9b in PreferredSize2 (tw=0x8d2af08, cw=41680, ch=1, reply_width=0xbfffe2ac, reply_height=0xbfffe2ae) at xlwtabs.c:1997 #5 0x081e824b in TabsGeometryManager (w=0x8dab5d8, req=0xbfffe4d0, reply=0xbfffe4b0) at xlwtabs.c:863 #6 0x4016003f in GeometryHandlerWrapper () from /usr/X11R6/lib/libXm.so.3 #7 0x4015fdf7 in GeometryHandlerWrapper6 () from /usr/X11R6/lib/libXm.so.3 #8 0x403efce4 in _XtMakeGeometryRequest () from /usr/X11R6/lib/libXt.so.6 #9 0x40403da0 in XtSetValues () from /usr/X11R6/lib/libXt.so.6 #10 0x081dcce5 in xm_update_label (instance=0x8d6d230, widget=0x8dab5d8, val=0x84c0878) at lwlib-Xm.c:289 #11 0x081dc28f in xm_update_one_widget (instance=0x8d6d230, widget=0x8dab5d8, val=0x84c0878, deep_p=0 '\0') at lwlib-Xm.c:309 #12 0x081e36e4 in xlw_update_tab_control (instance=0x8d6d230, widget=0x8da71d8, val=0x84b5f00) at lwlib-Xlw.c:449 #13 0x081e30d4 in xlw_update_one_widget (instance=0x4212a2d0, widget=0x8d2af08, val=0x84b5f00, deep_p=1 '\001') at lwlib-Xlw.c:569 #14 0x081da0e5 in lw_modify_all_widgets (id=1, val=0x84c01c0, deep_p=1 '\001') at lwlib.c:726 #15 0x081c1f75 in x_redisplay_widget (p=0x831d858) at glyphs-x.c:2299 #16 0x08140289 in redisplay_widget (widget=137484376) at glyphs-widget.c:499 #17 0x08138012 in redisplay_subwindow (subwindow=137484376) at glyphs.c:4537 #18 0x08185e18 in redisplay_output_subwindow (w=0x8da4410, image_instance=137484376, db=0xbffff0b0, dga=0xbffff0a0, findex=4, cursor_start=0, cursor_width=0, cursor_height=0) at redisplay-output.c:1243 #19 0x081c81be in x_output_display_block (w=0x8da4410, dl=0x8c7be98, block=137484376, start=0, end=1, start_pixpos=2, cursor_start=0, cursor_width=0, cursor_height=0) at redisplay-x.c:473 #20 0x08183f10 in redisplay_output_display_block (w=0x4212a2d0, dl=0x8c7be98, block=0, start=0, end=1, start_pixpos=2, cursor_start=0, cursor_width=0, cursor_height=0) at redisplay-output.c:1159 #21 0x08186608 in compare_display_blocks (w=0x8da4410, cdl=0x8d62be0, ddl=0x8c7be98, c_block=143568968, d_block=0, start_pixpos=2, cursor_start=0, cursor_width=0, cursor_height=0) at redisplay-output.c:523 #22 0x0818370b in output_display_line (w=0x8da4410, cdla=0x84dc840, ddla=0x84dc8a8, line=0, force_start=-1073745376, force_end=0) at redisplay-output.c:773 #23 0x0814e6b6 in output_gutter (f=0x84a6040, pos=TOP_GUTTER, force=0) at gutter.c:444 #24 0x0814cd87 in update_frame_gutters (f=0x84a6040) at gutter.c:637 #25 0x081782ff in redisplay_frame (f=0x84a6040, preemption_check=0) at redisplay.c:6586 #26 0x08181267 in redisplay_device (d=0x836ebd8, automatic=1) at redisplay.c:6679 #27 0x081816bb in redisplay_without_hooks () at redisplay.c:6766 #28 0x080facd0 in Fnext_event (event=139732408, prompt=1082884276) at event-stream.c:2179 #29 0x0809cf04 in Fcommand_loop_1 () at cmdloop.c:574 #30 0x080b735b in condition_case_1 (handlers=1082883892, bfun=0x809d1b0 <command_loop_1>, barg=1082884276, hfun=0x809d1c8 <cmd_error>, harg=1082884276) at eval.c:1652 #31 0x0809d394 in command_loop_2 (dummy=1082884276) at cmdloop.c:256 #32 0x080b7235 in internal_catch (tag=1, func=0x809d354 <command_loop_2>, arg=1082884276, threw=0x0) at eval.c:1318 #33 0x0809cc48 in initial_command_loop (load_me=1) at cmdloop.c:305 #34 0x080b4a1d in xemacs_21_4_12_i686_pc_linux (argc=1, argv=0xbffff854, envp=0xbffff85c, restart=0) at emacs.c:2460 #35 0x080b53e5 in main () at emacs.c:2892 #36 0x420158d4 in __libc_start_main () from /lib/i686/libc.so.6 (gdb) Regards, -- Katsumi Yamaoka <yamaoka(a)jpl.org&gt;