Errors when modifying content in Header

Yes, it's the "header" text for this view. The exported view is below.

To reproduce:

1) create a view page with alpha pager and enter some text into the header textarea.
2) after the view has been saved, edit the view again and modify what you entered in the header textarea.
3) go to the page for the view and the errors should appear.

Thanks for looking at this. -michael

--- start exported view ---

$view = new stdClass();
$view->name = 'resources';
$view->description = 'Featured resources';
$view->access = array (
);
$view->view_args_php = '';
$view->page = TRUE;
$view->page_title = 'Resources';
$view->page_header = '

';
$view->page_header_format = '2';
$view->page_footer = '';
$view->page_footer_format = '1';
$view->page_empty = '';
$view->page_empty_format = '1';
$view->page_type = 'list';
$view->url = 'resources';
$view->use_pager = TRUE;
$view->nodes_per_page = '10';
$view->sort = array (
array (
'tablename' => 'node',
'field' => 'created',
'sortorder' => 'DESC',
'options' => 'normal',
),
);
$view->argument = array (
array (
'type' => 'rss_feed',
'argdefault' => '2',
'title' => '',
'options' => '',
'wildcard' => '',
'wildcard_substitution' => '',
),
);
$view->field = array (
array (
'tablename' => 'node',
'field' => 'title',
'label' => '',
'handler' => 'views_handler_field_nodelink',
'sortable' => '1',
'defaultsort' => 'ASC',
'options' => 'link',
),
array (
'tablename' => 'node_data_field_url',
'field' => 'field_url_url',
'label' => '',
'options' => 'default',
),
array (
'tablename' => 'node',
'field' => 'created',
'label' => '',
'handler' => 'views_handler_field_date_small',
'sortable' => '1',
),
);
$view->filter = array (
array (
'tablename' => 'node',
'field' => 'type',
'operator' => 'OR',
'options' => '',
'value' => array (
0 => 'resource',
),
),
);
$view->exposed_filter = array (
);
$view->requires = array(node, node_data_field_url);
$views[$view->name] = $view;

I installed the new version but still getting the same error. Incidentally, I am inputting HTML into the header with Full HTML input filter. I think the header text is a red herring, because if I edit any field this error occurs. I just edited the title and the same thing happens.

This is on RC 1 with Views 5.x-1.4-2rc1. I'm at a loss as to why it doesn't happen on your build.