I've just submitted v2.1.2 to the Zen Cart moderators for review and will post back when it's available for download.

This release contains changes associated with the following GitHub issues:


#201: Virtual orders can't be checked out; correct the root-cause, not the symptom.
#202: Correct PHP Notice on checkout_success after guest-checkout.
#203: Correct integration with payment methods that "collect credit-card data onsite".