Hello;   Last Christmas my brother bought me  a $50  Gift Certificae.  However, when placing my order, the certificate code was shown as "invalid"  (....or some equivalent...I don't remember the specifics )   The end result was that I ended up paying the $50 myself, and my account still shows that I have an unused Gift Certificate.  I am just afraid of placing another $50 order and then having to pay for it myself.....any help/suggestions??