I've run into an XEmacs-20.4 etags.el buglet, where it gets into an nconc infinite loop when generating a (probably circular) list of files for tag tables. Below is a simple fix. If there are any follow-ups, please include me on the list because I'm not on the beta list. Thanks, Steve --- /local/xemacs/xemacs-20.4/lib/xemacs-20.4/lisp/packages/etags.el Sat Oct 18 09:04:11 1997 +++ ./etags.el Thu Apr 8 18:52:10 1999 ＠＠ -391,7 +391,7 ＠＠ (defun buffer-tag-table-files () "Returns a list of all files referenced by all TAGS tables that this buffer uses." - (apply #'nconc + (apply #'append (mapcar #'tag-table-files (buffer-tag-table-list))))