Nope I ran a full test with items in the Cart. The Paypal Express checkout option fires back to my home page - again I'm sure this is because I'm incorporating the checkout.php as an include. So it goes back to my home page because the file index.php includes the file checkout.php / index.php?mod=checkout.
How do you get WA to answer here? I really appreciate all your suggestions, but it's not a good form of support. A WA representative could probably answer this in one post.