I have discovered what I think (?) might be a bug.
I was having problems with Measurement.js not instantiating. I noticed ESRI samples do not have a dojoConfig... I then noticed my DojoConfig I'd set async to true. (Which is what we want ideally).
I turned async to false and that fixed Measurement.js both for local API and edge server API sites.
This should be fixed so we can use async mode. I have reported the bug but thought I'd mention it here in case others ran across this.
