Authorize.Net order library (file ending in order_lib.pl) was updated to better handle deletion of cart session files. Version increments to 06.6.00.0001.
New installs will have this update included. Updates for the order_lib.pl file can be done in the store upgrade manager after clicking on the gateway installer button, and then selecting the AuthorizeNet gateway and checking the box for Install/Upgrade Order Processing Libraries and then pressing the Install/Upgrade Selected Payment Gateway button.
