I type this command: tf workspaces into a command line and it tells me there are no workspaces on the machine. I then try the same command on the server, nothing. So I go into Visual Studio 2010 and create a new workspace and try to map the TFS path to my local path. I then get an error that the mapping already exists in another workspace. But I cannot find that workspace on my local or on the tfs server. Any ideas?
You can run tf workspaces /remove:* to clear out your local cache of workspaces. See this link for more details.