Hi Anthony,
I have not been able to replicate this issue on our test portal www21.smith-consulting.com. Please see the following links as an example:
http://www21.smith-consulting.com/Sto...
http://www21.smith-consulting.com/Sto...
Have you set the BuyNow page name in the Category module settings?
Can you login to our test site http://www21.smith-consulting.com/ and try to replicate the error. This will determine if the issue is with the latest version of the cart or an issue with your specific dnn portal/cart install.
For login credentials please send an email with a link to this post to kevin@smith-consulting.com.
Thanks,