Great ! I stopped synchronizing since it was too dangerous for my work.. However before stopping I sent an e-mail as you said, however not with all the clients logs, but only with my machine's log. (It was sent on Oct. 25 10:49 my time (Switzerland): object was "Files cannot be updated". I'll try to reproduce the bug and send you the logs if I manage too (but I cannot do it on my work files...) Thanks ! m Yes but that doesn't explain why one cannot delete a file without it re-appearing seconds afterwards, or why if I modify a word file, it is soon replaced by the previous version (and the new version moved to the archive).