With the Magento Patches 7405 and 7616, we noticed an error when trying to view the orders in the admin. The order page is blank.
admin->sales->order->view order
To resolve this issue, go to /app/code/core/Mage/Adminhtml/Helper/Sales.php
and find the code around line 124 that says $links = []; and change it to $links = array();
Now the orders will display.
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