cannot sync on imac

Hello, my mac was re-imaged. Now I cannot get zotero to sync. It does not provide an error message -- the arrow just keeps spinning. It did this last week, so today I uninstalled and re-installed zotero. Now I've been trying for 3 hours to sync. Just spinning.

Firefox 3.6.13, mac OS X 10.6.5.

Thanks.

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