After that ... things file smoothly. File Sent ... 5 min delay ... File Transfer OK. You can't use Synapse until the File Transfer OK. The other issue is .... all other clients can't do anything until the server responds to the client doing the filing. Essentially the one client stops the other 7 clients from doing anything ! I believe it is because of the large number of files we have. In the past I think you said it had to do with MD5 hashes. Ideas ?