sudden vim problem in mutt

[Ric Otte <ric@otte.ucsc.edu>]

Hi,

I've been using mutt with vim for a couple of years with no problem.
But recently I've noticed that when I reply and begin inserting text (on
the same line as, and right before the original message), the line does
not wrap when I get to 77 spaces (what I have set in .vimrc).  What
happens is that the text just continues on the next line, and I end up
with a very long line, unless I hit Enter (it doesn't matter if I insert
spaces in the text).  Strangely enough, this does not happen if I am
simply using vim or gvim outside of mutt.  I can even write an email
message to a file, and have the lines wrap when editing with vim, but it
won't do it when vim is called from mutt.  Even more strange, sometimes
vim will begin wrapping the lines later in the message, but I am not
sure how to reproduce this.  I do not believe I've changed my .muttrc
settings, but I might have changed something when pasting in quotations
or adding vimspell to .vim/plugins.  Unfortunately I can't remember what
I have done, if anything.   Any suggestions would be appreciated.  

Ric
here is my .vimrc file:

set list
set listchars=tab:>-
set textwidth=77
set fileformats=unix,mac,dos

set showcmd            " Show (partial) command in status line.
set showmatch          " Show matching brackets.
set ignorecase         " Do case insensitive matching
set incsearch          " Incremental search
"set autowrite          " Automatically save before commands like :next and :make

noremap <F8> :so `vimspell.sh %`<CR><CR>
noremap <F7> :syntax clear SpellErrors<CR>