Message

During a checkout a warning message was displayed:

"To prevent abuse from automated bots, you must click continue shopping before adding any more products to your cart"

Reason

This message appears after the checkout has been visited multiple times in a short period of time without updating the cart, giving the appearance of being an automated bot.  It's a bot prevention technique used to prevent a bot from taking over the checkout. (Such as adding so many items to the cart as to cause items with inventory tracking to become totally allocated to a single shopping session.

Solution

Clicking the continue shopping button tells UltraCart that it's a person and not a automated bot.