I have the same error here and it seems to me that the problem is somehow related to the warning-message i get:
Warning: in_array() [function.in-array]: Wrong datatype for second argument in /is/htdocs/…/bp-core.php on line 315 (the last line in the following code)
/**
* bp_core_is_root_component()
*
* Checks to see if a component’s URL should be in the root, not under a member page:
* eg: http://domain.com/groups/the-group NOT http://domain.com/members/andy/groups/the-group
*
* @package BuddyPress Core
* @return true if root component, else false.
*/
function bp_core_is_root_component( $component_name ) {
global $bp;
return in_array( $component_name, $bp->root_components );
}
