Error ID 631312235 Syncing failure
I just started using Zotero, and after entering four items, got a message that "a file sync error occurred." Restarted Firefox; same problem. Restarted computer; same problem. I just downloaded the newest versions of both Firefox and Zotero (not the Beta), so I'm already using the most up-to-date versions. This problem occurred after I attached a pdf to an item.
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You can also try creating a new Firefox profile, pointing it to your original Zotero data directory from the Advanced pane of the Zotero prefs, and trying to sync from there.
But if you get the same 401 error in a new Firefox profile, there may not be much we can do for you, since something about your setup—quite possibly on your network—appears to be preventing file syncing from working. Is your colleague using Zotero file syncing?
My colleague has no trouble using Zotero file syncing on campus, so I don't see how it could be a network issue or an issue with the university's security system.
So it says it is not working, but it is working -- which is good, but also annoying.