I restored Invoices 8.1A. There was no need to restore the data, I only had to restore the spec files. So far, they are the only files that we have found that were converted during the upgrade.
Some job numbers got blanked out in invoices and have to be re-entered, but that is a minor issue.
Andrew - unless you plan to come out with the JC 8.1B upgrade very soon, you might want to add a warning to the IN 8.1B upgrade telling users not to install it if they are using JC.
Steve