Don't try to visit any other files after visiting one in C++ mode in the latest CVS tree. It's fatal: Signaling: (invalid-regexp "Invalid preceding regular expression") string-match("c++-" "efs-mode") select-buffers-tab-buffers-by-mode(#<buffer "config_data.cpp"> #<buffer "*ftp anonymous(a)ftp.xemacs.org*&quot;>) #<compiled-function (buf) "...(5)" [buffers-tab-selection-function first-buf buf] 3>(#<buffer "*ftp anonymous(a)ftp.xemacs.org*&quot;>) delete*(nil (#<buffer "config_data.cpp"> #<buffer "*ftp anonymous(a)ftp.xemacs.org*&quot;>) :if-not #<compiled-function (buf) "...(5)" [buffers-tab-selection-function first-buf buf] 3>) apply(delete* nil (#<buffer "config_data.cpp"> #<buffer "*ftp anonymous(a)ftp.xemacs.org*&quot;>) :if-not #<compiled-function (buf) "...(5)" [buffers-tab-selection-function first-buf buf] 3> nil) delete-if-not(#<compiled-function (buf) "...(5)" [buffers-tab-selection-function first-buf buf] 3> (#<buffer "config_data.cpp"> #<buffer "*ftp anonymous(a)ftp.xemacs.org*&quot;&gt;)) buffers-tab-items(t) remove-buffer-from-gutter-tab() kill-buffer("*Backtrace*") call-interactively(kill-buffer) Evidently someone needs to be doing a regexp-quote.... -bp