>>>>> Michael Ekstrand wrote:
> Gnus v5.13
> GNU Emacs 23.0.60.1 (x86_64-pc-linux-gnu, GTK+ Version 2.12.9)
>  of 2008-03-15 on elegiac, modified by Debian
> 200 Leafnode NNTP Daemon, version 1.11.7.rc1 running at ahijah.elehack.net (my fqdn: ahijah.elehack.net)

> I'm running Gnus from Emacs CVS as of 2008-03-15 (Debian emacs-snapshot
> package), and get the following error when I attempt to view a PGP/mime
> signed message:

> byte-code: Wrong number of arguments: (lambda (target old new)
> (replace-regexp-in-string old new target)), 4

You use the color-theme package, don't you?  I got to it by
searching for the arguments list (target old new) in Google, and
discovered there is a serious bug in color-theme.el.  The problem
is due to the `replace-in-string' function that color-theme.el
defines thoughtlessly.  mm-util.el uses it as
`mm-replace-in-string', and it conflicts with the one that XEmacs
originally defines.  Here is a patch for color-theme 6.6.0: