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I’m also having the same issue. It didn’t happen until I used Magento Connect to update the core files to 1.3.1, with 1.3.0 everything worked fine. If no one can fix this issue it’d b nice to know how to downgrade back to 1.3.0.
Secondly, when viewing the outputted page’s source code it appears that the ssue lies in displaying the custom attributes of my simple products. All the order info is fine until it gets to actually displaying the product attributes. Weird.