BuddyPress.org

It sounds like you still have the widget registered with a phantom side bar. The comments for the function wp_register_sidebar_widget() says that doing the same call without a callback function unregisters the widget.

Try: wp_register_sidebar_widget( ‘buddypress-members’, __( ‘Members’, ‘buddypress’ ), “”);

Or: wp_unregister_sidebar_widget(‘buddypress-members’); which says it does the same thing.

Put that in bp-custom.php. That gets run before anything else in bp. Naturally this is a one time thing.