Tomboy Notes synced on Ubuntu One disappeared from my computer

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http://askubuntu.com – I'm running Ubuntu 12.04 LTS on my EeePC. Works pretty good. I have used Tomboy Notes for several years, and synced with Ubuntu One. Now this morning it seems all my Notes have disappeared, but the notebooks are still there. What's happened? How can I recover the lost notes? /Johan (HowTos)