TOPIC: PayPal Problem

Please help,
I have installed everything and all is working fantastic apart from, when a user tries to pay, my paypal page is saying:

'The seller accepts encrypted website payments only. You cannot pay the seller through un-encrypted buttons. Please contact your seller for more details."

Please can you tell me what I have done wrong.

I have enabled IPN and turned off Auto-Re-Direct.

Regards,
Reders

To Turn Off the PayPal Encrypted Website Payments Feature:

1. Log in to your PayPal account.
2. Click Profile.
3. From the Selling Preferences column, click Website Payment Preferences.
4. In the Encrypted Website Payments section, select Off.
5. Click Save.