I am the author of ToodleTask (the Android app), and have been asked a question on password issues a couple of times, so I've decided to add a comment here.
ToodleTask must confirm your authentication details with ToodleDo when you change your settings. If you play with your settings a lot, especially switching repeatedly between the "default folders" options, then ToodleDo (at their end!) thinks someone is tinkering with your account, an suspends it for one hour.
If you are having username and password issues, try entering the credentials without changing any other settings, then waiting an hour before adding a task.
Thank you so much to everyone for your 5 star ratings and suggestions!
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