I just ran into this with MAS 4.50 and legacy (Payroll) reports and forms. I ran the MASCRCW and converted everything, but when they went to print Payroll Checks, it barked at them that they had not been converted. If I opened the form and Verified Database, it would then work. Of course, this client does Payroll for hundreds of companies, and since most of the forms had subtle customizations, that was a bit of a bummer...