When I attempted to make use of a shared file, I received the message telling me that the file was not open on the server. I remoted in to the server and in fact, the server was stopped. When I pressed the Start button, instead of it just starting up like typically happens, I received a message stating that it could not as there was not registered account logged in. I had received something like this before, weeks ago. Clicking on the General tab to find the Log In page for my account fixed the current problem. I did not find the correct place to even see the logged in account, but I did receive a message that caused me to think all was ok. I then went to the Server tab, and pressed the Start button, and it started up without any further error message.
Sorry for the lack of actual text in the messages but too often, when this stuff happens, I am in a mode to get it going again as there is a real need to connect.