Why don't subtasks show up in the app?
Why am I not able to see sub-tasks in the Todoist android app.
I am using an HTC DNA with android 4.1
How did you add these sub-tasks? On the Android app or on Todoist.com? Are you on the latest version of the app? (1.2.10)
Which view are you trying to access these sub-tasks?
Please head to your Android settings, and go to the Applications area, and clear data for Todoist. Once that is done, re-log into the app. Let me know if it continues not to work.