Hello,

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$form = new \IPS\Helpers\Form();

$elements = array();
$options = array();
$toggles = array();
$unlimitedToggles = array();
$selected = -1;

foreach (array('foo', 'bar', 'baz') as $v)
{
	$options[$v] = $v;
	$k = 'test_select_toggles_' . $v;
	$toggles[$v] = array($k);
	$unlimitedToggles[] = $k;

	$elements[] = new \IPS\Helpers\Form\Text(
		$k,
		'',
		false,
		array(),
		null,
		null,
		null,
		$k
	);
}

$form->add(new \IPS\Helpers\Form\Select(
	'test_select_toggles_select',
	$selected,
	false,
	array(
		'options' => $options,
		'toggles' => $toggles,
		'multiple' => true,
		'unlimited' => -1,
		'unlimitedToggles' => $unlimitedToggles,
	)
));

foreach ($elements as $element)
{
	$form->add($element);
}

Result

All works as expected

---

Change $selected = -1; to $selected = 'foo';

Result

It should also display test_select_toggles_foo element.

---

Remove 'unlimitedToggles' => $unlimitedToggles,

Result

So there is a conflict between 'toggles' and 'unlimitedToggles'

I've logged a bug report to have this looked into.