[Ben L.]

I think changing

if ( !bb_current_user_can( 'edit_user', $user_id ) ) {

$sendto = bb_get_option('uri');

wp_redirect( $sendto );

}

in profile-edit.php to

if ( !bb_current_user_can( 'edit_user', $user_id ) || (!bb_current_user_can('use_keys') && $user->has_cap('use_keys')) ) {

$sendto = bb_get_option('uri');

wp_redirect( $sendto );

}

would fix the problem.