Thanks for the reply!

Problem was solved thanks to one of your Technical Managers who I was able to get on the phone. It seems that after the last update that either there was a change to the process between estimates and invoices or the update caused an auto check on with Progress Invoices, either of which made it impossible to convert an estimate to an invoice using a custom invoice template. By disabling that feature, I was able go about business-as-usual.

Thanks!

John