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I use the online Vault, accessing it from 3 machines, all running Firefox 23.0.1: an older XP desktop, a laptop running Windows 7, and a Surface Pro running Windows 8.
I added a login to the online Vault using the Windows 7 machine. The new login appears when accessing the Vault from the Windows 7 and Windows 8 machines, but does not appear in the Vault when accessed on the XP machine, even after turning off all machines overnight. Any ideas what could cause this lack of synchrony? Only thing I can imagine is somehow the XP machine retains a copy of the old vault...