Magento 1.6.1 Upgrade - Minor Bug Fixes for Magento Expert

Since updating two weeks ago from Magento 1.5.1 to 1.6.1 we've noticed a few minor issues that we need help from a Magento expert to solve. Here are the issues we are seeing: 1) When items are viewed in the cart the item price appears as $0.00, but the total is correct. Also, on invoices the item price appears as $0.00 while the total and all other values are correct. Digging deeper, the price entry in sales_flat_invoice_item is being written to as $0.00 as well as in sales_flat_quote_item. 2) Coupon codes (promotions->shopping cart price rules) no longer work on the frontend or backend. Codes can be created, but when they are entered the have no effect on pricing. This may be related to the issue above. 3) Automated emails with shipment details used to include the tracking number, but now this is not included in the email that is sent. The tracking number, which is sent to Magento from our shipping software [login to view URL], is being saved with the shipment details in Magento automatically, but does not appear on the email that is sent since the update to 1.6.1. We need the tracking number to be included on the email that is generated. We are looking to award this contract as soon as possible and look forward to your bid :). Cheers, David