PPV don't appear by the schortcode

Hi!

I just bought the PPV plugin, and I hope it will be a good solution for my website. I just installed it, pasted the paypal API code, and enabled it.

I have a problem tough, when I use the shortcode in my post, nothing happens. It's just as it were before.

Is there any typical problems with a fresh installment like this? Maybe some delay before the paypal API-signature works or something?

Any help with be gratefull appriciated.

Best regards,
Håkon