Custom redirect broken and paypal link broken in some cases

I've also found another bug -

1) Register as a new member, not a premium member here:
2) Click the 'Paypal' button on the next page

Expected: Takes me to paypal page
What actually happens: The page just refreshes

What I would *really* like to happen - I want to take the user to a specific page for standard members - this is where I'd introduce them to the biggest stuff going on.

Can you help?