Magento Version 1.6 has a bug related to isShippingLabelsAvailable() method.   When you try to make shipment an order you may be get a error :   Fatal error: Call to a member function isShippingLabelsAvailable() on a non-object in app/code/core/Mage/Adminhtml/Block/Sales/Order/Shipment/Create/Items.php on line 132   This error lies in the Mage_Adminhtml_Block_Sales_Order_Shipment_Create_Items class on line 130 within the canCreateShippingLabel() method. [...]

Some day before, I got a task to change the currency symbol for New Zealand. After some research, i got the solution. Now I am putting the solution here for reference: I had to change the currency symbol of New Zeland Dollar to NZ$. By default, the currency symbol for New Zeland Dollar is $. For this, you need [...]