Network Issues explained

The 5 servers are able to be seen. If you use network neighborhood and explore the servers, you can’t see the users.We installed an updated version of software and now can’t see those users using the software. We can see other users that aren’t using software. The users that are using new software can also use other resources on server. Why would an updated software app cause us not to see users again. Could it be something with the script files.