BuddyPress.org

There is a quickfix for this:

open /wp-content/plugins/buddypress/bp-core/bp-core-widgets.php and change the line 88.

from this:

<?php if ( bp_has_site_members( 'type=newest&max=' . $instance['max_members'] ) ) : ?>

to this:

<?php if ( bp_has_site_members( 'type=newest&max=' . $instance['max_members'] . '&per_page=' . $instance['max_members'] ) ) : ?>

I hope this helps.