I am in the same boat. When I open workbench by opening a file it's unconnected. When I select "connect to database" it connects to my "local server" I don't know what that is, just did the default server upon installation. Once done I get a blank tab where I can run and has my schemas. But when I open any files it puts it into an "unconnected tab" where I can't. I have been just copying and pasting into the local server tab