Index: bp-core/bp-core-cssjs.php
===================================================================
--- bp-core/bp-core-cssjs.php	(revision 1595)
+++ bp-core/bp-core-cssjs.php	(working copy)
@@ -28,7 +28,7 @@
 	global $bp;
 	
 	echo 
-'<script type="text/javascript">var ajaxurl = "' . $bp->root_domain . str_replace( 'index.php', 'wp-load.php', $_SERVER['SCRIPT_NAME'] ) . '";</script>
+'<script type="text/javascript">var ajaxurl = "' . trim($bp->root_domain,'/') . '/' . str_replace( 'index.php', 'wp-load.php', basename($_SERVER['SCRIPT_NAME']) ) . '";</script>
 ';
 }
 add_action( 'wp_head', 'bp_core_add_ajax_js' );