I have a drupal 7 form with a bunch of fields:

$form['account_type'] = array(
  '#title' => t('Utility Account Type'),
  '#type' => 'select',
  '#options' => necp_enrollment_administration_portal_account_type_options(),
  '#required' => TRUE,
  '#default_value' => isset($form_state['values']['account_type']) ? $form_state['values']['account_type'] : '',
);

// Should show if account_type = 1
$form['home_wrapper'] = array(
  '#type' => 'fieldset',
  '#states' => array(
    'visible' => array(
      ':input[name="account_type"]' => array('value' => 1),
    ),
  ),
);
$form['home_wrapper']['first_name_1'] = array(
  '#title' => t('Primary Account First Name'),
  '#type' => 'textfield',
  '#default_value' => isset($form_state['values']['first_name_1']) ? $form_state['values']['first_name_1'] : '',
  '#states' => array(
    'required' => array(
      ':input[name="account_type"]' => array('value' => 1),
    ),
  ),
);
$form['home_wrapper']['last_name_1'] = array(
  '#title' => t('Primary Account Last Name'),
  '#type' => 'textfield',
  '#default_value' => isset($form_state['values']['last_name_1']) ? $form_state['values']['last_name_1'] : '',
  '#states' => array(
    'required' => array(
      ':input[name="account_type"]' => array('value' => 1),
    ),
  ),
);

// Should show if account_type = 2
$form['business_wrapper'] = array(
  '#type' => 'fieldset',
  '#states' => array(
    'visible' => array(
      ':input[name="account_type"]' => array('value' => 2),
    ),
  ),
);
$form['business_wrapper']['company_name'] = array(
  '#title' => t('Company/Organization'),
  '#type' => 'textfield',
  '#default_value' => isset($form_state['values']['company_name']) ? $form_state['values']['company_name'] : '',
  '#states' => array(
    'required' => array(
      ':input[name="account_type"]' => array('value' => 2),
    ),
  ),
);

In Firefox/Chrome/Opera all versions this form behaves as it should. However in all versions of IE the form initializes with display:none; style on all of the conditional fields regardless of what the value in account_type is. Changing the selected option of account_type does not effect the hidden status.

Any tips on debugging this form would be awesome.

Notes:

• I am not much of a Drupal developer, I inherited this site. Just trying to iron out the last couple bugs so we can go live
• there are more fields than are listed above, I just gave you some of the applicable ones so that you could get the gist of how my forms were setup
• current url for the form in development: https://northeastcleanpower.com/enroll_new
• I'm using http://www.browserstack.com/ to debug IE 7 - 10pp4 (I think we only have to support 8 and up though)

I've also tried:

• ':select[name="account_type"]' => array('value' => 1),
• '#edit-account-type' => array('value' => 1),