Since the upgrade, we have lost various customization that we have done to various forms the main one being that our custom fields (formula fields) were printing "Null" on our invoices instead of calculating the formula like they used to.  This problem is occurring on both brand new invoices and for old invoices that we have tried to re-print. 

After talking to support at least daily for the past two weeks, this has still not been resolved.  I have finally created a brand new custom invoice form and created new custom fields.  Now they are calculating properly on the form within NetSuite but are printing blank on the invoice.  (Obviously this is not the best workaround either since now our data will be calculated/stored in two separate places - and doesn't work anyways, but we need to get our invoices out ASAP.)