Still having mail problems with version 0.88

[Lloyd Zusman <ljz@asfast.com>]

In pgnus-0.88 as well as 0.87 and 0.86, I've been having email
problems with pgnus.  Everything works fine in version 0.85, which I'm
using now.

In versions 0.8{6,7,8}, whenever new mail arrives I get this prompt
(followed by "Continue? "):

  Mail source error ((wrong-type-argument number-char-or-marker-p nil)). 

Here are all my `nnmail-*' and `mail-source-*' settings from my
`.gnus.el' file:

  (setq nnmail-tmp-directory "~/.incoming" 
        nnmail-use-long-file-names t 
        nnmail-cache-accepted-message-ids t 
        nnmail-crosspost nil 
        nnmail-spool-file                              
           '((directory :path "/home/gnus/.mailspool/" 
                        :suffix ".in")) 
        mail-source-spool-file 
           '((directory :path "/home/gnus/.mailspool/" 
                        :suffix ".in"))  
        mail-source-tmp-directory "~/.incoming" 
        mail-source-delete-incoming t 
        mail-source-movemail-program "/usr/bin/movemail"
  )

No doubt some of these are superfluous, but I haven't been closely
keeping track of which.  None of these have changed in ages, and all
work fine with version 0.85.

Any ideas?

Thanks in advance.

-- 
 Lloyd Zusman
 ljz@asfast.com