Can't synch

I can no longer synch with the Zotero server. The green icon on my main computer rotates endlessly, but nothing happens; I've tried overwriting the information on the server with the local copy, and then overwriting the copy on my main computer with the new server copy, but it seems that there's nothing on the server now.
I am using Zotero Storage with fully updated Zotero 2.0 Final (18 January update) on computers running Vista.
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