I believe their system is having some issues. I was trying to check the remaining balance on a VGC - the site gave me a black top half screen, while at the bottom it showed the register screen by itself... The screen tried to redirect but failed.

I then click the Visa symbol on the top left corner - that brings back the old screen with Registration / Check Balance / Change PIN. I was able to check the balance of the card in hand.

I always register the cards bought but never bother to change PIN - your card can be used as a credit card therefore change PIN means nothing if that is what you think it would protect the card not being hacked...