title: PHP 5.3.3 - running session_start() in subdirectory kills existing session
body: <p>I've been trying to track down some annoying session issues since my webhost upgrade to PHP 5.3.3 awhile back. I've determined that if there is an active session, calling session_start() from a subdirectory kills the existing session. As an example, I start a session and a user logs in to domain.com/index.php then the user navigates to domain.com/members/ which fires start_session() ... the user's session is lost.</p>
  
  <p>I've dug around for this and can't find anything similar. Is there a PHP configuration that would account for this behavior?</p>