UbuntuOne: stopped syncing on ubuntu 10.04

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http://askubuntu.com – I'm using Ubuntu 10.04 at home and at work, and use UbuntuOne to sync the two computers. It worked perfectly for almost two years. Just recently, it stopped syncing as I reached the 5GB limit that comes with a free account. I removed some folders locally on the two computers so that now in Ubuntu One Preferences, it shows "4.3 GB USED (85.8%)". However, it is permanently disconnected on both computers. Clicking 'Restart' does nothing but enables me to click 'Connect', but clicking it has no effect. Any ideas on how to reestablish the connection and begin syncing files? Thanks! (HowTos)