I am still having major problems after installing the latest version for the /checkout/onepage/
I have tried reinstalling with clean db, upgrading the old db and still the same error. I have also tried doing a complete re-install but still an error:
go to http://www.ydnacentral.com then add a product and try check out. The problem occurs on:
if anyone can shed any light on this, it would be much appreciated.