Periodically, xemacs will "hang" (stop taking input, not refresh screen). When killed, the back traces look like: Lisp backtrace follows: own-selection-internal(CLIPBOARD "\n" nil nil) # bind (zmacs-region-stays data-type how-to-add type data) own-selection("\n" CLIPBOARD) # bind (push string) own-clipboard("\n" t) # bind (replace string) kill-new("\n") # bind (undo-high-threshold tail verbose end start) kill-region(558 559) # bind (entire-line arg) kill-line-1(nil nil) # bind (arg) kill-line(nil) # bind (command-debug-status) call-interactively(kill-line) # (condition-case ... . error) # (catch top-level ...) Lisp backtrace follows: own-selection-internal(CLIPBOARD &quot;xemacs-beta-request(a)xemacs.org&quot; nil nil) # bind (zmacs-region-stays data-type how-to-add type data) own-selection(&quot;xemacs-beta-request(a)xemacs.org&quot; CLIPBOARD) # bind (push string) own-clipboard(&quot;xemacs-beta-request(a)xemacs.org&quot; t) # bind (replace string) kill-new(&quot;xemacs-beta-request(a)xemacs.org&quot;) # bind (end start) copy-region-as-kill(403374 403404) # bind (end start) kill-ring-save(403374 403404) # bind (command-debug-status) call-interactively(kill-ring-save) # (condition-case ... . error) # (catch top-level ...) Lisp backtrace follows: own-selection-internal(CLIPBOARD &quot;xemacs-beta-request(a)xemacs.org&quot; nil nil) # bind (zmacs-region-stays data-type how-to-add type data) own-selection(&quot;xemacs-beta-request(a)xemacs.org&quot; CLIPBOARD) # bind (push string) own-clipboard(&quot;xemacs-beta-request(a)xemacs.org&quot; t) # bind (replace string) kill-new(&quot;xemacs-beta-request(a)xemacs.org&quot;) # bind (end start) copy-region-as-kill(403374 403404) # bind (end start) kill-ring-save(403374 403404) # bind (command-debug-status) call-interactively(kill-ring-save) # (condition-case ... . error) # (catch top-level ...) Lisp backtrace follows: own-selection-internal(CLIPBOARD "src/" nil nil) # bind (zmacs-region-stays data-type how-to-add type data) own-selection("src/" CLIPBOARD) # bind (push string) own-clipboard("src/" t) # bind (replace string) kill-new("src/") # bind (undo-high-threshold tail verbose end start) kill-region(27 23) # bind (count) kill-word(-1) # bind (count) backward-kill-word(1) # bi: gary＠rules[19] ; nd (command-debug-status) call-interactively(backward-kill-word) # (condition-case ... . error) # (unwind-protect ...) read-minibuffer-internal("Find file: ") byte-code("..." [standard-output standard-input prompt recursion-depth minibuffer-depth t read-minibuffer-internal] 2) # (catch exit ...) # bind (mouse-grabbed-buffer current-prefix-arg minibuffer-history-variable minibuffer-history-position minibuffer-scroll-window) # (unwind-protect ...) # bind (minibuffer-default _history_ oconfig mconfig frame buffer window oframe owindow dir default abbrev-table history readp keymap initial-contents prompt) read-from-minibuffer("Find file: " "~/cdev/RSAcore/dev/se/src/" #<keymap read-file-name-map size 2 0xd3c> nil file-name-history nil "~/cdev/RSAcore/dev/se/src/sePTVMgr.cxx") # bind (minibuffer-completion-table minibuffer-completion-predicate minibuffer-completion-confirm last-exact-completion insert completer initial-contents must-match default dir prompt history) read-file-name-2(file-name-history "Find file: " nil "~/cdev/RSAcore/dev/se/src/sePTVMgr.cxx" nil nil read-file-name-internal) # bind (completer initial-contents must-match default dir prompt history type) read-file-name-1(file file-name-history "Find file: " nil "~/cdev/RSAcore/dev/se/src/sePTVMgr.cxx" nil nil read-file-name-internal) # bind (history initial-contents must-match default dir prompt) read-file-name("Find file: " nil nil nil) call-interactively(find-file) # (condition-case ... . error) # (catch top-level ...) That's four of them. They all have in common the kill-new function. Has anyone else seen this? Any ideas what I can try? OS: HP-UX 10.20 compiled with HP's Ansi C compiler Motif 1.2 (from HP). gary