Notice: bbp_setup_current_user was called incorrectly.

Hi. I am getting the following notice when both membership and bbpress are activated.

Notice: bbp_setup_current_user was called incorrectly. The current user is being initialized without using $wp->init(). Please see Debugging in WordPress for more information. (This message was added in version 2.3.) in /home/joe/www/apassm.org/wp-includes/functions.php on line 3370

I've seen other people with this notice but not in relation to the membership plugin. It seems that one of the calls to 'wp_set_current_user' within the membership plugin is being called before 'after_setup_theme' has fired.

How can I go about fixing this?
Thanks