Our A/P person who does all of our Invoicing from PO was having some problems with her Windows 7 workstation. When she tried to shut down her computer, it would restart itself. Other strange behaviors in Windows plus several failed attempts to correct it, I decided to delete the partitions and re-install Windows 7. Since then several Invoices were processed from PO with no errors. I suspect the workstation instability may have been causing the data corruption in Adagio PO and very hopeful it is resolved now.