I have a user who has 2 machines, one is Vista, and the other is XP.
One day, he had move some file from one folder to another (offline, not
connected to ifolder server) on his Vista machine. Then he come back to
office and sync them.

From the web interface, all file seems sync correctly. However, his
another XP machine did not sync anything down from the server.

Since then, a strange behavior on his account. Any changes on his vista
machine, xp machine or directly changed on the web, will NOT sync to any
of the clients (both xp and vista).

Any ideas?