Hi George (@glawton),
I’ve seen this problem from time to time. Usually it disappears after I’ve done the following: checked in the Inspector for the files above that one is set to 64 bit and the other to 32 bit, made sure build settings was set to PC, Mac & Linux Standalone – Target Platform: Windows, restarted Unity Editor.
We are working on an updated Unity SDK that will not have this problem. Would you be interested in a pre-release version of this SDK? I could e-mail it to the e-mail address registered with your login here.