can not expose a filter in views for drupal 7

Hello,

I'm trying to update my site to drupal 7 and running into some anticipated problems, but the one that is really baffling me is with exposed filters for views.

So obviously the existing exposed filters for views from my drupal 6 installation were not recognized. I removed those and tried to recreate some exposed filters, but no matter how many times/ways I click that check box to expose a filter, when I check again, it is unchecked, and I can confirm that no filter gets exposed, and the code says that no filters are set to be exposed when I export a view.

This looks like a problem with the interface for views in that it's not registering my placing a check in that expose filter checkbox, but I can't be sure.

I've tried using different admin interfaces (including default) and different browsers, (firefox 4, ie9 and chrome)

Is there some way I can manually edit a view? if it's just a matter of setting exposed to TRUE, i think I can manage that..

Any help would be greatly appreciated.

here's the export:

$view = new view;
$view->name = 'Trails';
$view->description = 'List of Trail Descriptions';
$view->tag = 'Trails';
$view->base_table = 'node';
$view->human_name = '';
$view->core = 0;
$view->api_version = '3.0-alpha1';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Defaults */
$handler = $view->new_display('default', 'Defaults', 'default');
$handler->display->display_options['title'] = 'Trails';
$handler->display->display_options['access']['type'] = 'perm';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['pager']['type'] = 'full';
$handler->display->display_options['style_plugin'] = 'default';
$handler->display->display_options['row_plugin'] = 'node';
/* Header: Global: Text area */
$handler->display->display_options['header']['text']['id'] = 'area';
$handler->display->display_options['header']['text']['table'] = 'views';
$handler->display->display_options['header']['text']['field'] = 'area';
$handler->display->display_options['header']['text']['empty'] = TRUE;
$handler->display->display_options['header']['text']['content'] = 'Choose a combination of filters to find the trails you\'re interested in.';
/* Filter criterion: Content: Type */
$handler->display->display_options['filters']['type']['id'] = 'type';
$handler->display->display_options['filters']['type']['table'] = 'node';
$handler->display->display_options['filters']['type']['field'] = 'type';
$handler->display->display_options['filters']['type']['value'] = array(
'trail' => 'trail',
);
$handler->display->display_options['filters']['type']['expose']['operator'] = FALSE;
/* Filter criterion: Fields: Closest City (field_city) - value */
$handler->display->display_options['filters']['field_city_value']['id'] = 'field_city_value';
$handler->display->display_options['filters']['field_city_value']['table'] = 'field_data_field_city';
$handler->display->display_options['filters']['field_city_value']['field'] = 'field_city_value';
$handler->display->display_options['filters']['field_city_value']['value'] = 'Calgary';

/* Display: Page */
$handler = $view->new_display('page', 'Page', 'page_1');
$handler->display->display_options['path'] = 'trails';
$translatables['Trails'] = array(
t('Defaults'),
t('Trails'),
t('more'),
t('Apply'),
t('Reset'),
t('Sort by'),
t('Asc'),
t('Desc'),
t('Items per page'),
t('- All -'),
t('Offset'),
t('Choose a combination of filters to find the trails you\'re interested in.'),
t('Page'),
);