Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email email@example.com.
If a person goes to the one page checkout and selects either “Checkout as Guest” or “Register” and the clicks on “Continues”, the Billing Information box slides open and shortly after that one is redirected to: