A patch is needed for users who are using version 0.6.01 downloaded prior to 7/21/2006.  Depending on your settings at PayPal it is possible for your visitors to be charged sales tax twice.  This patch splits the order amount, sales tax, and shipping and sends these values to PayPal separately rather than as a total overriding the PayPal tax settings.

To download the patch file or for more information, please visit this topic on our forums