same problem here. in the usage tutorial, Will says that the server config needs to be saved under sftp_servers/ folder, but doesn't say where this folder needs to be. I'm guessing this is the problem.
update:
I figured this out by looking around. The Command "browse packages" takes you to a folder where all the packages are installed, and there is the User/sftp_servers/ folder. If you copy your server config file to this folder, you should be able to browse the servers.