Thanks for reaching out! I was not able to reproduce this.
From which version you just upgraded?
Can you see the names of the environments OK from the Environments screen? If you can, try clearing your browser’s cache and then click on “Deploy to” again.
Yes I was able to reproduce that error only in Edge. Even though we will support that browser, I’d still recommend you to use any other browser for the time being until Edge is a bit more mature.
I was just coming to post the same thing and saw this thread.
I see my environments in Chrome but in IE 11 (and Edge) I see the {{C.Name}} entry. I thought it was a corrupt database value but apparently it’s browser specific.