First, thanks for this very nice theme. Good work!
Next, I think there's a small bug in functions.php (1.7.1). In function catchbox_comment_form_fields, you forgot to define $commenter, maybe with
$commenter = wp_get_current_commenter();
In debug mode, I got the notice message:
Notice: Undefined variable: commenter in /Users/vincent/Sites/gdrmoa/wp-content/themes/catch-box/functions.php on line 879
But not a big deal for me (I don't use comments !)