It's definitely &sortBy. This is from the Peoples snippet code:
$sortBy = $modx->getOption('sortBy',$scriptProperties,'username');
That said, I got the same result you did. It was working before because that property was ignored. When it's typed correctly, Peoples turns it into this, which apparently won't fly:
$c->sortby('User.RAND()','ASC');
I think you'll need a custom snippet.
Try this:
/* ShowUsers snippet */
$output = '';
$c = $modx->newQuery('modUser');
$c->sortby('RAND()');
$c->limit(4);
$c->where(
array('modUser.active' => true)
);
$users = $modx->getCollectionGraph('modUser', '{"Profile":{} }', $c);
foreach ($users as $user) {
$fields = array_merge($user->toArray(), $user->Profile->toArray());
$output .= $modx->getChunk('OurTeamRowTpl', $fields);
}
return $output;