I am using v 6.5.2 on my iPhone 11. Today, when I activated GoodTask, all my lists and all my tasks were gone.
I immediately isolated from the internet my MacBook (v 6.5.5) and my iPad (v 6.5.2) and everything -- all lists & tasks -- is still there.
I have obviously done something to mess up sync. I don't know what that might be.
How do I fix it?