I solved the problem, it turns out that the server took my old ip address (192.168.1.5), it used to be (192.168.1.7) and I was using this rather than the computer name to get to it. I all of a sudden I am 192.168.1.4. I don't have the ip addresses locked down anywhere, it's hard to see how a firmware update could affect it.
Cheers, Tom.