Problem MIME decoding in rmail

[twurgl]

I get a mail that is a MIME encoded GIF file that rmail attempts to decode and 
display.  I have (auto-image-file-mode 1) in my .emacs.

It comes up in rmail as an empty 1/2" square.  So I write the mail to a file 
and compare the GIF file with
a decoded file not from rmail.  The only difference is that on line 32, at the 
beginning of the line, the file via
rmail has a up-carrot and then an underscore as individual characters.  The 
proper file has a ^_ (ctrl underscore).

So I changed the ^_ (individual chars) to ^_ (ctrl underscore)  and emacs then 
displays it properly.

So somehow that one char didn't decode correctly.  But there are a lot of ^_ 
(ctrl underscores) in the GIF and all the
rest decoded ok.  I don't know why this one didn't.

I hope this is all clear enough.  If not, please ask and I'll try again.

I did try with emacs -Q with the same results.

This is using emacs 22.0.95 on SuSE Linux x86_64 compile with gcc 3.4.6.