I have been working for some time before it crashed on me. I had a variable help window open, (C-h v ...), and pressed q to close it, and XEmacs crashed. I think, but am not sure, that before bringing up the help I had only one window in the frame. Relevant top of stack trace was: get_builtin_face_cache_index(window * 0x01e5a600, long 28332160) line 1335 + 30 bytes output_gutter(frame * 0x01b90a00, int 0) line 227 + 16 bytes update_frame_gutters(frame * 0x01b90a00) line 356 + 13 bytes redisplay_frame(frame * 0x01b90a00, int 0) line 6358 + 9 bytes redisplay_device(device * 0x01d98f00, int 1) line 6471 + 11 bytes redisplay_without_hooks() line 6560 + 11 bytes redisplay() line 6623 Fnext_event(long 33008984, long 28360708) line 2238 Fcommand_loop_1() line 566 + 16 bytes Current line was: for (elt = 0; elt < Dynarr_length (w->face_cachels); elt++) Select members of the w structure were: w->face_cachels: 0 w->pixel_top: 380 w->pixel_left: 0 w->pixel_height: 344 w->pixel_width: 578 w->mini_p: (Qnil) w->next: (Qnil) w->prev: (Qnil) w->parent: (Qnil) w->dead: 1 It looks like FRAME_LAST_NONMINIBUF_WINDOW in output_gutter picked the dead window. I could not track this any further right now. Big K