Won't change only window

recently, when I want to visit a folder in VM and I hit TAB twice to get a completions window I get this backtrace: Signaling: (error "Won't change only window") shrink-window(1 nil #<window on "*Completions*" 0x3c6f>) byte-code("..." [window-live-p window pos-visible-in-window-p test-pos shrink-window 1 nil n] 4) shrink-window-if-larger-than-buffer(#<window on "*Completions*" 0x3c6f>) show-temp-buffer-in-current-frame(#<buffer "*Completions*">) minibuffer-completion-help() minibuffer-do-completion("~/Mail/") #<compiled-function nil "...(97)" [last-command this-command nil minibuffer-scroll-window window windowp window-buffer buffer-name obuf (...) pos-visible-in-window-p set-window-start scroll-other-window minibuffer-do-completion buffer-string status none unique temp-minibuffer-message " [Sole completion]" exact " [Complete, but not unique]" t] 4 808756 nil>() call-interactively(minibuffer-complete) read-minibuffer-internal("Visit folder: (default ~/Mail/Inbox/BlueSky-RnD) ") byte-code("..." [recursion-depth minibuffer-depth t standard-input standard-output read-minibuffer-internal prompt] 2) read-from-minibuffer("Visit folder: (default ~/Mail/Inbox/BlueSky-RnD) " "~/Mail" #<keymap read-file-name-map size 2 0xd37> nil vm-folder-history nil "~/Mail/Inbox/BlueSky-RnD") read-file-name-2(vm-folder-history "Visit folder: (default ~/Mail/Inbox/BlueSky-RnD) " "/u/turner/Mail" "~/Mail/Inbox/BlueSky-RnD" nil nil read-file-name-internal) read-file-name-1(vm-folder-history "Visit folder: (default ~/Mail/Inbox/BlueSky-RnD) " "/u/turner/Mail" "~/Mail/Inbox/BlueSky-RnD" nil nil read-file-name-internal) read-file-name("Visit folder: (default ~/Mail/Inbox/BlueSky-RnD) " "/u/turner/Mail" "~/Mail/Inbox/BlueSky-RnD" nil nil vm-folder-history) byte-code("..." [read-file-name prompt dir default must-match initial history] 7) vm-keyboard-read-file-name("Visit folder: (default ~/Mail/Inbox/BlueSky-RnD) " "/u/turner/Mail" "~/Mail/Inbox/BlueSky-RnD" nil nil vm-folder-history) vm-read-file-name("Visit folder: (default ~/Mail/Inbox/BlueSky-RnD) " "/u/turner/Mail" "~/Mail/Inbox/BlueSky-RnD" nil nil vm-folder-history) (list (vm-read-file-name (format "Visit%s folder:%s " ... ...) default-directory default nil nil (quote vm-folder-history)) current-prefix-arg) (let ((default-directory ...) (default ...) (this-command this-command) (last-command last-command)) (list (vm-read-file-name ... default-directory default nil nil ...) current-prefix-arg)) (save-excursion (vm-session-initialization) (vm-check-for-killed-folder) (vm-select-folder-buffer) (let (... ... ... ...) (list ... current-prefix-arg))) call-interactively(vm-visit-folder) more info o 21.2b34, cvs-update this AM o VM 6.72 o Irix, gcc-2.95.2 o gutters turned off o other similar operations work fine (e.g. C-x C-f TAB TAB TAB) did I change something to cause this (I don't remember any relevant changes), or is this due to a change in XEmacs? I don't think it's a change in VM, as I've been using 6.72 for a while... -- John A. Turner, Senior Research Associate Blue Sky Studios, One South Rd, Harrison, NY 10528 http://www.blueskystudios.com/ (914) 825-8319