Version 2.1.0 has been tested with WordPress 3.4.2 successfully. Enhancements in this version include:

• Enables email notification of one or more fulfillment centers automatically.
• You can have as many suppliers as you have products and provide each with all the information needed to fulfill an order.
• Mail to yourself to keep tabs on what orders have come in and where they were sent.

Read more about the plugin here.