I am testing the developer which was downloaded today.
When testing Authorize.Net the sale is showing as successful on the checkout/success page. However, in admin under orders the transactions are showing as cancelled.
There is a setting in system/settings/order,
Cancellation Order Status
Select the order status when an order is marked as canceled or suspected of fraudulent activity
Whatever this is set to shows on the order page, cancelled, pending, received etc. Before the upgrade this wasn't happening.
Another issue I have noticed. If you do more than one purchase the orders are overwritten in admin. This used to happen for COD purchases but was fixed.