Magento blank sales order view page after SUPEE 7405 patch

If you applied the SUPEE 7405 patch or upgraded to Magento 1.9.2.3 and suddenly you found out that your sales order pages are blank, then here’s a quick fix. Just copy app/code/core/Mage/Adminhtml/Helper/Sales.php to app/code/local/Mage/Adminhtml/Helper/Sales.php, then open it. Find $links = []; then replace it with $links = array(); then save it. Clear your cache and… Continue reading Magento blank sales order view page after SUPEE 7405 patch