Unusual archiving behavior.

[David Brown]

I have

  (setq gnus-default-archive-saver 'gnus-summary-save-in-mail)

and the nnfolder default copied out of the manual, as one of my
gnus-secondary-select-methods:

        (nnfolder "archive"
                  (nnfolder-directory "~/Mail/archive")
                  (nnfolder-active-file "~/Mail/archive/active")
                  (nnfolder-get-new-mail nil)
                  (nnfolder-inhibit-expiry t)))

And my gnus-message-archive-group is set to

  (setq gnus-message-archive-group
        '((concat "nnfolder+archive:" (format-time-string "%Y"))))

If I invoke a message from within Gnus, this seems to work, it adds the
message to ~/Mail/archive/2010 as I would expect.

However, if I compose a message from elsewhere in Emacs (C-x m), the
message is archived to ~/Mail/2010 and not under the archive folder.

Any ideas what might be happening here?  I'm running the Gnus that is
part of Emacs 23.2

Thanks,
David Brown