In debugging this issue, I found that if a Product - General has option attributes it goes into a loop of logging in at the site, then loggin in at PayPal, then clicking PayPal's "pay now" button and being brought *not* to the site's "thank you" page, but instead to the site's "create account" page and if you create a new account (mind you, you already have one, and were already logged in to it), you are taken back to PayPal where you log in and pay and are then taken back to the site to the create account page again, and so on ad nauseum. And no order is logged in the database.
I also tested on Document - Product with attributes, and it worked fine. Also tested Product - General and Document Product *without* attributes, and it worked fine.
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