I'm trying update a website already published but muse won't connect with Business Catalyst when i try to publish.
I've got the same issue. It was working just fine before the update.
Does your CC Icon look like this?
If not, you don`t have connection to CC and so no connection to BC, I guess.
Are you able to connect to BC now?
Can you please try Help> sign out and sign it back to Adobe Muse and see if it works?/