Index: fuzzyfinder.vim
===================================================================
--- fuzzyfinder.vim	(revision 29158)
+++ fuzzyfinder.vim	(working copy)
@@ -1543,7 +1543,7 @@
 
 function! s:SetLocalOptionsForFuzzyfinder(cwd, complete_func)
   " countermeasure for auto-cd script
-  execute ':lcd ' . a:cwd
+  execute ':lcd ' . substitute(a:cwd, " ", "\\\\ ", "g")
   setlocal filetype=fuzzyfinder
   setlocal bufhidden=delete
   setlocal buftype=nofile

してみた。\ の数がすんごいことになってるよ!!!