mh-e not refiling my messages!

[Stephen E. <S.J...@da...>]

Just today (and I think it only started today) I've noticed that mh-e is
not refiling my messages, which is worrying!  If I press 'o' to
mh-refile-msg, it prompts for a folder name, and then marks the msg as
deleted, but the msg is not put into the folder.  (If I give a folder
name that doesn't exist, that folder gets created, but is empty.)  I
can't think that I've changed anything in the last few days, and I don't
yet use the rmmproc that I enquired about recently.  I can debug elisp,
but I thought I'd ask here first in case there were any obvious
contenders I should look at!

Stephen