[Plugin: Maintenance] Breaks Ajax Pages

This may seem like an obscure issue, but it keeps me from using your otherwise beautiful plugin.

I have a php document in a custom theme that is used to handle ajax requests. As is typical for such files, in order to have access to WordPress functions, I start the file with:

define('WP_USE_THEMES', FALSE);
	require($_SERVER['DOCUMENT_ROOT'] . '/wp-blog-header.php');

When your pluggin is enabled, this breaks and I get the error:

Fatal error: Call to undefined function get_userdata() in [...]/wp-includes/user.php on line 1402

This occurs because when your plugin is loaded in wp-settings.php line 198, you call the get_userdata() function. But the get_userdata() function is not defined until wp-includes/pluggable.php is included on line 202 of wp-settings.

http://wordpress.org/extend/plugins/maintenance/