Same problem. The tasks seem to load and then they disappear. Not a single tasks or list is showing up. So frustrating, I wonder how many months is going to take to Google to acknowledge and then fix it. It is device independent, I tried on 2.2, 2.3 and even on the Chrome Desktop Browser using mail.google.com/tasks/android and same issue. I need these tasks as they help me be very productive.
I have attached a picture of how on Gmail on Chrome Desktop I can see my tasks fine, but on the Google Mobile for Android browser it does not show any.