Hi, I think the following patch will fix a problem in flyspell.el, namely the failure to check in `flyspell-unhighlight-at' that `flyspell-overlay' is a valid (non-nil) overlay: --- flyspell.el Wed Dec 9 15:34:40 1998 +++ /home/tudor/flyspell.el Tue Mar 30 21:15:21 1999 ＠＠ -1051,7 +1051,8 ＠＠ (if (flyspell-overlay-p (car overlays)) (delete-overlay (car overlays))) (setq overlays (cdr overlays)))) - (delete-overlay flyspell-overlay))) + (when (overlayp flyspell-overlay) + (delete-overlay flyspell-overlay)))) ;*---------------------------------------------------------------------*/ ;* flyspell-properties-at-p ... */ The bug can be triggered by setting flyspell-persistent-highlight to nil in .emacs. Regards, Tudor