Johan, Steen. Thank you for your fast reply! Good Cookie Monsters get a cookie!
And on the topic of COOKIES, here is what PayPal has to say about the matter:
Technical HTML Variables
Technical HTML variables control how PayPal responds technically when people click Website Payments Standard payment buttons or when third-party or custom carts initiate payment processing with the Cart Upload command. They also control how your buttons interact with special PayPal features.
- lc —The language of the login or sign-up page that subscribers see when they click the Subscribe button. If unspecified, PayPal determines the language by using a cookie in the subscriber’s browser. If there is no PayPal cookie, the default language is U.S. English.
For allowable values, see Currency Codes.
HTML Variables for Filling Out PayPal Checkout Pages Automatically
HTML variables for filling out PayPal checkout pages automatically let you specify information about buyers. PayPal recommends that you include automatic fill-out variables with all of your payment buttons for consistent address handling in the checkout experience of your buyers.
To determine how the checkout experience varies if you do not pass in automatic fill-out variables, see Address Handling (U.S. Merchants Only).
NOTE: When you pass in address_override=1 or tax or shipping variables, PayPal displays the values in the payment widget. Also, PayPal hides the calculation widget, regardless of setting up shipping and tax rates in your Account Profile.
- lc —Sets the language for the billing information/log-in page only. The default is US. For allowable values, see Countries and Regions Supported by PayPal.
Ok, I will dissect the this spam-cloned plugin of yours and do some more testing.