FWIW, patch is at
http://list-archive.xemacs.org/pipermail/xemacs-patches/2011-April/010543.html

New node added to FAQ Troubleshooting section.

Mike may be working on detecting symlinks and/or automount artifacts;
assigned to him.

This occurs if you have duplicate packages on your load-path.  A common
cause is that XEmacs finds "package root directories" that are
duplicates of each other.  This can occur in some automounter
configurations, or when the roots share some subtrees via symlinks.

Package root directories are specified at configuration time via the
--prefix, --exec-prefix, and the --with-*-packages options; at runtime
relative to the XEmacs binary (../share or ../lib (older versions) and
.. (for run-in-place)); and at runtime via the EMACS*PACKAGES
environment variables.

On Sat, 05 Mar 2011 11:54:47 -0500, in Message-ID:
<4D726AD7.7020303@gmail.com> on xemacs-beta, Raymond Toy reported:
 
[N]ow every time I start xemacs, I get 100+ error messages stating that
the auto-autoload for every package has already been loaded. 
 
If I start xemacs with -no-site-file and click on the Load Init Files 
button, I don't get these messages.