I've never seen that problem, though I did manage to integrate PayPal with some of my sites using IPN. Might be best using one of those example PayPal forms - to start from. Then maybe migrate to the IPN system. IPN integration can be a bit tricky, but, it works well. I tend to code my websites with PHP/MySQL as I don't like WP or Magento. PayPal worked for me on: <removed> and <removed> just by using the IPN method. The sandbox is defo worth a look. Using the SOAP stuff looked a bit overboard for me lol.
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