ToDo will no longer open on my iPhone. When I click on the ToDo icon the blue ToDo screen appears and immediately disappears and I return to my Home screen.
If you have not already, open a ticket with support. I am not sure how much they monitor the forums and they have always been responsive when I have opened a ticket.
I too have had the same issue when I updated my iPhone 5 to 9.0.1 yesterday. I also have Todo 6. Now it won't open - it freezes on 'No tasks' for about 15s then closes completely. I have closed it by swiping it from memory as above, I have tried to find an update, I have shut the phone down and turned it back on, and I have tried in flight mode. No worky Todo anymore. Which is slightly worrying as I rely heavily on it in my day to day and I have no idea how to get Todo onto iCloud. Can you please help?
Sorry, I forget what I did exactly. My issue was also after an iOS update. I think that I doubled tapped the Home button on my phone and swiped the Todo page off the top of the phone screen to get it out of memory. Then I clicked on the Todo icon on my Home screen and it worked.