BuddyPress.org

modemlooper, can you do me a favor? Change line 29 in the file:

/mu-plugins/bp-core/bp-core-cssjs.php

to this:

'<script type="text/javascript">var ajaxurl = "' . get_blog_option(1, 'siteurl') . '/' . MUPLUGINDIR . '/bp-core/bp-core-ajax-handler.php' . '";</script>';

That should solve the 404 problem on your site.