DrByte,
The duplicate issue doesn't occur on every order and has occurred in the past when using Authorize.net so I don't think it is related to Paypal. That being said I did look into the things you mentioned.
The solution here is probably for me to switch away from Tableau and use the new one provided in 1.5.5. The problem is that getting my existing site(s) to look the same using a new template isn't a quick fix. I'm also surprised, because I couldn't find any other mention of this issue related to Tableau. I'm going to custom replace the includes/templates/tableau/templates/tpl_checkout_confirmation_default.php and see if that fixes anything.
When looking at Admin->Customers->PayPal there are no notes, only a link to the order (whereas refunded items include additional notes.)
There are no changes to:
/ipn_main_handler.php
/includes/auto_loaders/paypal.core.php (and all the files mentioned inside it)
/includes/modules/payment/paypal/functions_paypal.php
Although the part 'ad all the files mentioned inside it' was not double checked.


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