Comment 1 for bug 829563

I believe the app crashes when we fail to fetch notes. If your connection is working fine, then my guess would be that you don't have a mobile subscription with Ubuntu One. Unfortunately, to be able to sync to the U1 notes with OAuth this is required (and I believe it costs $3.99/mo). Without this, the sync will fail.

I will be adding an alert when fetching notes fails, letting you know if it is because you don't have the subscription or because of a network issue.

Thanks for the report!