Weird Subdirectory Problem

I keep my previous years mail in subdirectories, so I have the top level 
Directory 'Mail'
with about 50 folders, one of which is 'OLD'.  In 'OLD' I have some tar files 
(of really old
mail) and the subdirectories 2008, 2009, 2010, 2011, and 2012.  

I just added the 2013 subdirectory with the command 'add OLD/2013/Mime' Where 
Mime
is a folder in 2013.   

Now if I touch the middle mouse button on 'OLD' I get a dropdown showing the 
(previous)
2008-2012 directories, but not the new 2013 directory.  I must be doing 
something wrong
but its not obvious to me what it is, and until I figure this one out I cant 
move my old mail
out of the current directory.

Any Ideas?

Incidently, this is EXMH version 2.7.2 01/07/2005
-- 
                                        Reg.Clemens
                                        [email protected]