I am using latest as well.

What order did you selected the edges, or are there overlapping / duplicate edges that I missed?

<edit / update>

I just went into the file again and selected the edges in an order that I KNOW I did not use before and it worked fine.

That is interesting. Same edges just a different order worked.

Michael G - if you appear, is edge selection order a normally picky? I typically try to use reasonable starting positions when I am blending, lofting, sweeping, etc. but in this case it when it worked the second time for me I went in the opposite direction as before and started both selections in a different area than the first time. Fluke? Luck? Or does it sound like I ran into a rare issue?