Hi, I have used Zotero sync on multiple computers for years and encountered a new sync issue i've never hit before. both computers windows 10, zotero 5, but one of the computers stopped syncing on 9/20/2020. before 9/20, all syncing is fine. after 9/20 items added on this computer do not sync to the library, and items added by other computers sync to the library but not to this one errant machine. but there is no error icon by the sync icon, and when i mouse over the sync icon it says it is synced.

the one thing i can think of is that it's an update issue--i do not have admin rights on the malfunctioning computer so it was running a year-old 5.0.79, but i updated it today and the sync did not catch up. it still has access to my library because sync-on-demand is working fine for items that were added prior to the sync breakdown.