When attempting to connect to FTP server and upload my site, I get this:
"Could not sign you in [Failure establishing ssh session]. Check your user name and password."
User name and password are correct (I am able to successfully establish ssh session with another program). What is happening here?
Given that Muse is End of Life, there will no doubt be problems ahead as this software is no longer being developed or improved. If you're able to transfer files with another FTP client, keep doing it that way. My guess is something changed on your server and Muse cannot cope with it.
That was my suspicion too. Too bad.