CVS of right now, menu packges/update index, the file window opens and on clicking ok: Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 1080620832 (LWP 12054)] 0x0825d6fc in find_window_mirror_internal (win=142841352, rmir=0x0, w=0x881cb70) at /home/galibert/xemacs/xemacs-21.5/src/window.c:576 576 for (; !NILP (win); win = XWINDOW (win)->next, rmir = rmir->next) #0 0x0825d6fc in find_window_mirror_internal (win=142841352, rmir=0x0, w=0x881cb70) at /home/galibert/xemacs/xemacs-21.5/src/window.c:576 #1 0x0825d6c4 in find_window_mirror_internal (win=142839616, rmir=0x877cab0, w=0x881cb70) at /home/galibert/xemacs/xemacs-21.5/src/window.c:591 #2 0x0825d8f7 in find_window_mirror (w=0x881cb70) at /home/galibert/xemacs/xemacs-21.5/src/window.c:656 #3 0x0825dae9 in window_display_lines (w=0x881cb70, which=0) at /home/galibert/xemacs/xemacs-21.5/src/window.c:704 #4 0x081de4a8 in redraw_cursor_in_window (w=0x881cb70, run_end_begin_meths=1) at /home/galibert/xemacs/xemacs-21.5/src/redisplay-output.c:1130 #5 0x081de791 in redisplay_redraw_cursor (f=0x8811178, run_end_begin_meths=1) at /home/galibert/xemacs/xemacs-21.5/src/redisplay-output.c:1200 #6 0x080eb336 in emacs_handle_focus_change_preliminary (frame_inp_and_dev=143039784) at /home/galibert/xemacs/xemacs-21.5/src/event-stream.c:1775 #7 0x082358f6 in handle_focus_event_2 (win=35652406, f=0x8811178, in_p=1) at /home/galibert/xemacs/xemacs-21.5/src/event-Xt.c:1609 #8 0x08235743 in handle_focus_event_1 (f=0x8811178, in_p=1) at /home/galibert/xemacs/xemacs-21.5/src/event-Xt.c:1542 #9 0x082359ed in emacs_Xt_handle_widget_losing_focus (f=0x8811178, losing_widget=0x885ba20) at /home/galibert/xemacs/xemacs-21.5/src/event-Xt.c:1650 #10 0x08242e37 in x_unmap_subwindow (p=0x885ab38) at /home/galibert/xemacs/xemacs-21.5/src/glyphs-x.c:2040 #11 0x0814a0d4 in unmap_subwindow (subwindow=142977848) at /home/galibert/xemacs/xemacs-21.5/src/glyphs.c:4778 #12 0x08149588 in unmap_subwindow_instance_cache_mapper (key=140427648, value=142977848, finalize=0x1) at /home/galibert/xemacs/xemacs-21.5/src/glyphs.c:4462 #13 0x080cf3c6 in elisp_maphash (function=0x81493fb <unmap_subwindow_instance_cache_mapper>, hash_table=142703304, extra_arg=0x1) at /home/galibert/xemacs/xemacs-21.5/src/elhash.c:1397 #14 0x08260e78 in window_unmap_subwindows (w=0x882f2d0) at /home/galibert/xemacs/xemacs-21.5/src/window.c:2065 #15 0x08260f19 in mark_window_as_deleted (w=0x882f2d0) at /home/galibert/xemacs/xemacs-21.5/src/window.c:2086 #16 0x08261ab8 in Fdelete_window (window=142799568, force=1080902736) at /home/galibert/xemacs/xemacs-21.5/src/window.c:2308 #17 0x080d9f03 in Ffuncall (nargs=2, args=0xbfffbd44) at /home/galibert/xemacs/xemacs-21.5/src/eval.c:3842 #18 0x0809f115 in execute_optimized_program ( program=[...] At that point the copy/paste breaks and I just can't be bothered. Save with File/Open, and probably all the others. How the hell one can break Fdelete_window and not notice? OG.