I've managed to create a widget for Trello and have logged in. However, it isn't showing any of my projects and still shows the 'sign in' button.
For further info ... I login using my Google Account and 2 factor Google authentication. Secondly, initially I was getting a 400 page not found error. Not sure if this helps.
(This looks like it could be a really great tool. I'm forever jumping between online and offline resources.)
@nsuffield Well I tried login out of the main Trello site and then went back into Freeter and now it's working. Odd.
@nsuffield Thanks for reporting the issue and your solution. It might be somehow related to the Google Auth.