On OS X 10.5 Emacs 23.2, in dired-mode, if I try to sort by dired-sort-toggle-or-edit with prefix argument --sort=extension or -X, I get: insert-directory: Listing directory failed but `access-file' worked and the dired buffer becomes empty. I tried setting (setq dired-use-ls-dired nil) but this had no effect. dired-sort-toggle-or-edit and sorting by extension seems to work okay on my Ubuntu box.
![error in dired sorting on OS X](https://cdn-ak-scissors.b.st-hatena.com/image/square/98d6f053a97a87156775f60757c60865d0f2c47d/height=288;version=1;width=512/https%3A%2F%2Fcdn.sstatic.net%2FSites%2Fstackoverflow%2FImg%2Fapple-touch-icon%402.png%3Fv%3D73d79a89bded)