I have also experienced this problem of FAM corrupting its own files. This has happened to me four times. Believe it or not, when I searched this problem on the Internet, this problem existed in 2012 with tax preparers making the same exact comments. Clearly those in charge at Intuit/ProSeries pay no attention to the inherent problems and glitches in this program. The program is a "stepchild" as it does not update with the rest of ProSeries. Additionally, no one at ProSeries tech support could even tell me if the first version was ever updated. It would require manual updatiing if there was an update. The solution is to move on to a different tax software provider. Why bang your head against the wall working with defective software from a company that is indifferent in regard to customer issues?