That's what happened to me too. 2018 file was saved (last) on April 15. I re-opened it a week ago - was prompted to apply updates - so I did that. Then TurboTax prompted me to start a new file - no tax file showed up in the program. There indeed is a .tax2018 file in the TurboTax folder but opening it from Windows Explorer results in the same thing - no data, even though the file size is big enough that there should be data in it. I called Support, but they wouldn't help me further until I applied the latest Windows updates - - which didn't resolve anything with this issue.
