"Sync with Zotero Server" is stuck

I have zotero on several computers. Its working fine on most of them but on my desktop the "Sync with Zotero Server" is stuck at "Getting updated data from sync server". The problem persisted for about the past week. Yesterday I removed both Zotero and Firefox and then reinstalled. To no avail. It is still stuck trying to sync to the server after several hours.
I have Webdav for syncing attachments and a number of groups.

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