Turn on 'Switch back to http': all forms break

Using Drupal 4.7.3, version 4.7 of securepages.module (downloaded today)

When i set this option to checked
"Switch back to http pages when there are no matches",
all forms on my https:// pages point to an http:// action, and they no longer work.

To recover I have to add this to my settings.php to override the variable 'securepages_switch'

$conf = array(
'securepages_switch' => FALSE
);