PayPal - Credit card "already added to a PayPal account" but NOT

[MeltDown]

I'm using PP IPN and running Zen 1.3.6 so no PayPal patch installed. Here's the glitch I'm having:

From checkout, the customer proceeds to the PayPal page and selects:

Don't have a PayPal Account?

Use your credit card or bank account (where available).

They enter their information but receive the following error message after attempting to proceed:

The email address or credit card has already been added to a PayPal account. If you have already opened a PayPal account, enter your email address and password into PayPal Checkout and click Log In. Otherwise, enter a different email address or credit card number to complete your purchase.

However, the email address and credit card have not been added to a PayPal account. This is happening with a live card, not in the sandbox.

Any idea what this may mean?

Thanks!

[MeltDown]

Sorry - My bad. The credit cards actually were associated with Paypal, all three of them! It seems that the all-invasive Paypal was even more invasive then I thought!