Hi, I did that and the default theme worked fine with formkey validation on. So I then had a look at the rwd template and the files you referred to. By adding <?php echo $this->getBlockHtml(‘formkey’) ?> to the line before the closing </form> in those 3 files (like it is in the rwd template), I am now able to have form validation on and proceed through the checkout. Thanks for your help. It helped me get there.