Soren Dayton <dayton(a)overx.com&gt; writes: You really should report this to Michael Kifer. I have idea why the extent gets destroyed at the moment. Does this help as a stop gap measure diff -u /scratch/vroonhof/cvs/xemacs-20/gcc-2.95/xemacs-packages/lisp/viper/viper-util.el~ /scratch/vroonhof/cvs/xemacs-20/gcc-2.95/xemacs-packages/lisp/viper/viper-util.el --- /scratch/vroonhof/cvs/xemacs-20/gcc-2.95/xemacs-packages/lisp/viper/viper-util.el~ Sun Dec 19 11:21:31 1999 +++ /scratch/vroonhof/cvs/xemacs-20/gcc-2.95/xemacs-packages/lisp/viper/viper-util.el Sun Dec 19 11:21:31 1999 ＠＠ -70,7 +70,7 ＠＠ (fset 'viper-overlay-start (symbol-function 'extent-start-position)) (fset 'viper-overlay-end (symbol-function 'extent-end-position)) (fset 'viper-overlay-put (symbol-function 'set-extent-property)) - (fset 'viper-overlay-p (symbol-function 'extentp)) + (fset 'viper-overlay-p (symbol-function 'extent-live-p)) (fset 'viper-overlay-get (symbol-function 'extent-property)) (fset 'viper-move-overlay (symbol-function 'set-extent-endpoints)) (if (viper-window-display-p) Jan