Supporter 3.0 Beta: Bug

Running Supporter 3.0 beta on new MS install, minimal plugins.

If I go to 'Settings' and change anything in General Setting or Email Notifications, it fails
==============
Fatal error: Call to a member function get_page_permastruct() on a non-object in home/agric/public_html/wp-includes/link-template.php on line 276
==============

Here's Line 276
=============
$link = $wp_rewrite->get_page_permastruct();
=============

When do you anticipate to be out of Beta?
Thanks!