Reopening current buffer's file

[Paul Dembry]

In 21.3.1 (old suse machine), I can do the following:

1. Open a file, e.g. moose
2. c-x c-f
3. Presuming that moose has been changed externally, emacs asks "File moose
changed on disk. Reread from disk? (yes or no)"
4. Answer yes and it reopens the file

In 24.2.1 (new suse machine), c-x c-f always opens a directory listing. I 
am
using the same $(HOME)/.emacs file. I cannot figure out how to have 24.2.1
behave the same way as 21.3.1. Is this a simple setting in the options? I 
could not find one.

Thanks,
Paul