I kept getting server not found errors on all my home networked computers. I tried the suggestion of updating the software, and that did not work. I had forgotten about the settings in the configurator! For some reason, after a power outage or a router snafu, the address for the computer running the server changed. When I opened the configurator, I simply entered the new address of the server, and everything worked swimmingly.
I do point out that the original settings on the configurator were set to automatically find the server, so I am not sure why it stopping doing that. All is working fine now.