BuddyPress.org

not to code-savvy but what fixed it for me:

bp-messages-cssjs.php:

`jQuery(“ul.first”).autoCompletefb({urlLookup:’root_domain . str_replace( ‘index.php’, ‘/wp-load.php’, $_SERVER ) ?>’});`

pulled the wrong path to wp-load.php for my single site wp subdomain installation. Like http://DOMAIN/SUBDOMAIN/SUBDOMAIN//wp-load.php

Replacing it with the commented line fixed it for me:

`jQuery(ul.first).autoCompletefb({urlLookup:’root_domain . ‘/wp-load.php’ ?>’});`

I’ll file a proper bug report later.