ANyone could guide me to what page A customer should see when he tries to redeem a Gift certificate through the link in his received email ?

All seems to work well , I mean the GV value is added to the persons account (if he was logged in allready) but the link directs to a blank page or blank page after logging in .

index.php?main_page=gv_redeem&gv_no=xxxxxxxxx = blank page

Thanks