Setting the order for groups

The order is set regarding to the Order filter of the groups directory, so user has the choice between :
Last Active
Most members
newly created
Alphabetical

In Group Admin you can use the filterable feature of groups table header to reorder by name / number of members or last active.

I’ll publish an upgrade in a couple of days to include the ajax fix for groups widget and i’ll include a filter so that you can force the filter to what suits you best.

So after line 313, i’ll add :
$sticky_sql['order'] = apply_filters( 'bp_sticky_groups_sticky_order', $sticky_sql['order'] );

Then you’ll be able from your functions.php to force the order the way you want by using a function like this :

function dgesin_forces_sticky_order( $order = '' ) {
    //as an example applying random order
    return 'ORDER BY rand()';

    /* other "BuddyPress" possibilities are :
    'ORDER BY g.date_created DESC'                  //newly created
    'ORDER BY last_activity DESC'                   // last active
    'ORDER BY CONVERT(gm1.meta_value, SIGNED) DESC' //popular
    'ORDER BY g.name ASC'                           // alphabetical */
}

add_filter( 'bp_sticky_groups_sticky_order', 'dgesin_forces_sticky_order', 10, 1 );

I advise you to use one of these orders.