What happened to my lists

Upgraded to a new version, had one old to-do list and made another one after the upgrade. 3 hours later, theyre both gone! Poof, just gone. What good is a list-making app that deletes the lists you make? The only reason Im giving 2 stars instead of one is because its been a good app in the past. Wont ever use it again.

Cagey23 about List Master Pro - Your Lists, v4.1.4