I have a site where I have adding some custom shipping logic to the FC checkout template, and it works fine. That site runs FC 1.0. I have another site where I've copied that shipping logic over to. That site runs FC 1.1.
I'm going to whisper the store URLs of each site to some of you, if you would be so kind as to take a look and give me your thoughts. There are a bunch of console.log lines throughout the code, because I've been trying to trace this issue down all day.