PayPal IPN Order Total Incorrect v1.3.7.1 with addons

Hello,

I am running 1.3.7.1 with the PayPal IPN module enabled. If a customer places an order with shipping thats being taxed (or gift wrapping), the total being sent to PayPal is incorrect.

I can see inside the PayPal logs that the amount field is wrong. It's not calculating the tax for shipping and is not including any gift wrapping fees.

For example...

[amount] => 189.39 should actually be [amount] => 193.00

Does anyone have any ideas how to modify the includes/modules/paypal.php file to calculate the order total correctly?

Note - I'm also using the Authorize.net AIM module and the total being passed to Authorize.net is correct.

Thanks in advance for your help!